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Jordan Journal of Physics, Vol. 18, No 4, pp. 529-549 (2025). https://jjp.yu.edu.jo/index.php/jjp/article/view/323.   https://doi.org/10.47011/18.4.10

 

On the origin of cosmic microwave background radiation

 

Sergey G. Fedosin

PO box 614088, Sviazeva str. 22-79, Perm, Perm Krai, Russia

ORCID 0000-0003-3627-2369,   E-mail: sergey.fedosin@gmail.com

 

The alternative mechanism of the emergence of cosmic microwave background radiation (CMB), associated with the thermal radiation of primordial gas-dust clouds in the early Universe, is considered. The emergence of such clouds in the theory of infinite hierarchical nesting of matter is a natural stage in matter evolution. The mass, radius, and spatial concentration of typical primordial gas-dust clouds, the distance between neighboring clouds, and the power of CMB energy generation per unit volume and per nucleon of the early Universe were calculated. The masses and radii of these clouds correspond to the masses and radii of the observed Bok globules. The presented mechanism is consistent with the cluster model describing the appearance of angular multipoles in the CMB power spectrum. In addition to CMB radiation, cosmic infrared background (CIB) radiation and cosmic optical background (COB) radiation are also considered. According to the presented model, the sources of CIB are primordial protoplanetary clouds. As for the COB radiation, it is associated with the radiation of the first protostars. During evolution, each primordial cloud, with a mass of about 31 solar masses, first generates CMB radiation, and then CIB and COB radiations. Since protostars give rise to neutron stars, the concentration of primordial gas-dust clouds is also the concentration of observed neutron stars. In the course of the calculations, a new definition of the radiation intensity is used, which is based on the vector of the surface energy flux density and accounts for the angles of incidence of radiation on a flat receiver from all sides of the hemisphere. According to Poynting's theorem, the relationship between the intensity and energy density of black body radiation is derived from the concept of photons.

Keywords: cosmic microwave background; infinite hierarchical nesting of matter; early Universe; cosmology: theory; matter evolution.

PACS: 98.70.Vc

 

1. Introduction

The cosmic microwave background radiation (CMB) in the wavelength range of 0.3-30 mm contributes most to the total energy of cosmic background radiation. The standard explanation for the origin of CMB based on the Big Bang concept, in which CMB appeared in the early Universe. However, the idea of the Big Bang still has drawbacks [1]; therefore, other alternative cosmological theories continue to appear. For example, in the quasi-steady-state cosmological model, it is assumed that CMB could be the result of processing stellar radiation by cosmic dust [2].

However, even in this case, there are difficulties associated with the fact that the CMB is too homogeneous and isotropic and has a spectrum of ideal black body. According to the dynamic Universe model [3] and the hierarchical Universe model [4], the stellar radiation in the early Universe could be sufficient for CMB to have the observed energy density and be isotropic, so that the Big Bang is not needed. According to [5], the models based on a Universe in dynamical equilibrium without expansion predicted the 2.7 K temperature prior to and better than models based on the Big Bang. In addition, it was shown in [6] that isotopes of all the observed chemical elements can be formed from hydrogen in stars during the time of the order of 100 billion years, which makes it possible to do without the Big Bang.

It is known from measurements [7] that the CMB temperature corresponds to the blackbody temperature  К. If the CMB is in equilibrium with respect to some global blackbody of the Universe, it would have a volumetric energy density equal to  J/m3, where  is the Stefan–Boltzmann constant, and  is the speed of light. This relation characterizes, for example, the state of a hollow black body, which is in thermal equilibrium with radiation in the inner cavity. The surface of such a cavity emits and absorbs radiation energy with an intensity of  W/m2. This means that ideal receivers, close in their properties to a blackbody, will measure in the cavity the CMB intensity on the order of . In this case, the contribution to the intensity  will be made by photons incident on the receiver at various angles.

In measurements, the angular intensity  is often used, where  denotes the solid angle in steradians, from which the radiation arrives at the receiver. In accordance with the Stefan–Boltzmann law, for CMB radiation, if it were in thermal equilibrium with matter as in a hollow black body, the following relation would be true:  W/(sr·m2). This value is in accordance with the results in [8].

When plotting the radiation spectrum of a blackbody, the dependence of the spectral angular intensity  on the radiation frequency  is usually plotted. This value reaches a maximum when a small frequency range  is selected near the frequency  GHz, corresponding to the maximum in CMB radiation. In accordance with Wien’s law of displacement for the frequency there is , where the constant ,  is the Planck constant,  is the Boltzmann constant, and the radiation temperature  is measured in Kelvin.

The purpose of this work is to explain the origin of background radiation in the model of a hierarchical Universe. Based on the thermal equilibrium of radiation and matter of radiation sources in the early Universe, we will find the sizes of these sources, their masses and concentration in space. As will be shown below, in the presented approach the formula  for the energy density of background microwave radiation in the Universe can no longer be valid, as well as for background infrared radiation and background optical radiation.

 

2. Definition of intensity

The standard definition considers intensity as the amount of energy passing per unit of time through a unit area oriented perpendicular to the direction of energy propagation.  To take into account various orientation angles of the receiver with respect to the incident radiation, a different definition should be applied. In the concept of photons, we can assume that intensity is the magnitude of a certain vector, namely the vector of the surface density of the radiation energy flux.

Let us assume that the radiation receiver responds only to the radiation component, which is perpendicular to the receiver plane. This can happen, for example, when the receiver is sensitive to the momenta of the photons falling on the receiver from all sides. Then the momenta components of the set of photons, which are parallel to the receiver plane, mutually cancel each other, and the sum of the perpendicular momenta components of the photons is considered. In this case, we can assume that the energy flux surface density vector  is determined by the amount of incident radiation energy on the flat radiation receiver from all sides of the hemisphere per second per unit area  of the receiver, taking into account the angular dependence:

 

                               (1)

 

 

 

where  denotes the energy of the photon with momentum amplitude ; the index  specifies the photon number during summation in (1);  is a unit vector directed along the photon momentum , such that ;  is a unit normal vector directed to the receiver plane from the hemisphere;  defines the force acting from the photon on the receiver; is the force projection on the normal;  denotes the pressure from the photon’s side, perpendicular to the receiver surface; and  is the total perpendicular pressure from all photons.

 

If we take into account that the electromagnetic radiation pressure is , then according to (1), we have

 

,                     .                                   (2)

 

In (2), the vector  is directed in the same way as the unit normal vector  and is proportional to the speed of light and the electromagnetic pressure on the receiver.

The difference between  and  in (2) can be attributed to the well-known 4/3 problem, according to which the mass-energy  of the electromagnetic field of a charged body moving at a very low velocity, derived from the Poynting vector and proportional to the field momentum density, is 4/3 times greater than the mass-energy , corresponding to the field energy density. The relation  corresponds to the equality , so that the radiation pressure  is related to the Poynting vector, and the pressure  exerted on the receiver is related to the field energy density. According to [9], the 4/3 problem occurs because the electromagnetic field energy density and the field momentum density are not the four-momentum components but rather the field stress-energy tensor components.

To check formula (1), first place the receiver on the surface of the sphere of radius , at the center of which there is a certain source with the power of isotropic radiation . In this situation, the radiation falls on the receiver at a right angle. In (1) the scalar product  is obtained, and the energy flux density recorded in the receiver is then equal to:

 

.                                                              (3)

 

Let us consider another situation, when one of the many existing radiation sources is the volume element . We can assume that  is the differential of the radiation energy, leaving the volume element   per unit time . Let us choose the hemisphere radius , where  is the speed of light, and place the receiver at the coordinate origin on the plane  at the center of the hemisphere. This situation is shown in Figure 1.

 

Надпись: Fig. 1. The receiver D (in this case rectangular in shape) is located at the coordinate origin on the plane   at the center of the hemisphere of radius R, the current radius r and the angles   and   specify the position of the radiating volume element   in the spherical coordinate system.

 

Now, all the radiation energy contained in the hemisphere with a radius  falls into the receiver at time . Then, in spherical coordinates for the intensity differential of the volume element  located inside the hemisphere at a distance  from the center, in accordance with (1) and (3), we have:

 

,                                                  (4)

 

where  is the volume element considered as a source of isotropic radiation; the product  defines the angular dependence of the radiation intensity so that at  photons move along the  axis and do not enter the receiver at all; and at , photons move in the  plane and do not enter the receiver either. If , and , photons fall on the receiver at a right angle to its surface and make the maximum contribution to the intensity. The appearance of  in (4) follows from the fact that, according to Figure 1, , , and in definition (1), we have .

 

Integration over the hemisphere’s volume replaces the summation in (1) and gives the following:

 

.                                 (5)

 

The calculation in (5) shows how, in the case of equilibrium blackbody radiation, we can understand the relation between the intensity  and the energy density  of radiation that enters the receiver from different directions. Hence, we can see that  is actually related to the mass-energy of the field energy density, and not to the mass-energy of the momentum density, which is found using the Poynting vector.

 

3. CMB energy production

It is known that CMB radiation originates from large distances; therefore, in one way or another, it is generated by many sources. Let us assume that, on average, each cubic meter of the early Universe was a source of CMB and produced  joules of CMB energy per second; then, the volumetric power  of energy generation is measured in W/m3. Next, we proceed as in [4].

Let us suppose that radiation sources uniformly fill the hemisphere, while radiation from some sources does not fall on the receiver at a right angle. This means that to determine the intensity , we should integrate the entire hemisphere’s volume and take into account the angles of incidence of radiation on the receiver, similar to (4) and the definition of intensity in (1). We will place the receiver at the origin of the coordinate system and position it in the ZOX plane to measure the CMB energy.

If some radiating volume is located at a distance  from the origin of coordinates, then the effective amount of energy , incident per unit time on the unit area of the receiver, will be equal to:

 

,                                 (6)

 

where  is the Hubble constant.

 

The first exponent  in (6) describes the exponential decrease in the energy of CMB photons as they travel a distance .

 

As a result, the wavelength of the photons is shifted, which is known as the cosmological redshift of the spectra of distant radiation sources.

The second exponent  sets the degree of scattering of photons on their way to the receiver, reducing the number of arriving photons. This exponent corresponds to the Beer–Lambert law for light scattering, and  is the scattering cross section,  is the concentration of objects scattering light.

Let us take the integral in (6) over the volume of the hemisphere of infinite radius:

 

.            (7)

 

In (7), the relation between the measured intensity  and the volumetric power  of CMB energy generation in cosmic space is presented.

Considering that the exponent  in (7) describes the exponential decrease in energy, as well as in the frequency of CMB photons as they travel a distance , the following is obtained for the photon wavelength and redshift:

 

,         ,          .

(8)

 

If in (8)  is small compared to unity, then , which leads to the Hubble law in the form .

 

Due to the decrease in energy and scattering of photons in (6), some blurring of images of distant galaxies should be observed, since photons change their motion direction as a result of scattering. In fact, the observed blurring is insignificant, which can be explained by the small size of the electrogravitational vacuum particles described in [4] and [10], which are unable to significantly change the direction of the photons’ momenta. We can also refer to more recent works [11-12], in which, in light of new data, the observed dependence of the duration of supernova explosions on the distance to them, the dependence of the surface brightness of galaxies on the redshift, the relationship between redshift, relict radiation, and the blackbody spectrum were analyzed.

In addition, observations of the angular radii and surface brightness of galaxies at a given luminosity do not correspond to the expanding Universe hypothesis in the  model, but are in good agreement with relation (8), which describes the relationship between distance and redshift, as well as with the static Universe model [13-14], in which the surface brightness does not depend on the redshift . With relation (8), the supernovae type Ia data give almost the same result as the  model.

 

4. The sources of CMB

In the theory of infinite hierarchical nesting of matter [4], [10], [15], it is assumed that the substance of a certain level of matter arises in the course of evolution of the substance of lower levels of matter. Therefore, stars as objects of the stellar level of matter appear after the compression of large gas clouds. The main objects of these clouds are nucleons belonging to the nucleon level of matter. In turn, the appearance of gas clouds is a consequence of evolution of the substance of the praon level of matter, and praons can form the substance of nucleons in the same way as nucleons can form the substance of stars.

Based on this, suppose that in the early Universe, the entire volume was more or less uniformly filled with CMB sources at concentration , the average radius of these sources was equal to , and the effective temperature of particles on the surface of these sources was equal to the temperature . In this case, we can write:

 

.                                                         (9)

 

In (9), the CMB generation power per unit volume  is expressed through the surface area of a typical CMB source, equal to , through the intensity  of radiation from this surface, and through the concentration  of CMB sources in Universe.

 

Substituting  from (7) in (9) and taking into account that , we find:

 

.                                                      (10)

 

 

 

We assume that during the time needed for CMB photons to reach the Earth from distant regions of the Universe, the number of baryons and their concentration in cosmic space did not change significantly. Then, in the first approximation, we can use the conclusions of the  model (Lambda-cold dark matter model), where the critical mass density reaches the value  kg/m3, if we assume that the Hubble constant  equals 70 km/(s·Mpc) or s-1 [16].

The physical density of the visible baryonic matter in this case is  kg/m3. This value is chosen in such a way that, among other things, it best fits observations of the amount of visible matter in galaxies. This approach will be sufficient for us since we will further derive various relationships, the physical meaning of which does not depend on the specific value of .

Let us now take into account that the CMB sources, that is, the primordial gas-dust clouds, were located discretely in space with a concentration , where  is the mass of a typical CMB source. Each source has a cross section equal to . At very large distances, all sources begin to overlap each other, which makes it difficult to see the most distant CMB sources and weakens the intensity of the radiation that could be at the radiation receiver. This leads to the appearance of the exponent  in (6).

The mass of a typical source is expressed by the formula , where  is the mass density of the source substance. Expressing  from here and substituting into (10), taking into account the equality,  we have:

 

,                .                             (11)

 

 

The last formula in (11) relates the radius , mass density  of CMB sources and the effective temperature  of the surface particles of these sources.

 

5. The origin of energy in CMB sources

For the particles of numerous CMB sources to have a kinetic temperature on the order of  and to be able to subsequently radiate at this temperature, it is necessary that the particles of these sources somehow acquire the corresponding thermal energy as the energy of proper motion.

Let us turn to the theory of infinite hierarchical nesting of matter, according to which different matter levels are found in the Universe, and the main objects of these levels have significantly different masses and sizes. In particular, there are metagalactic, stellar, nucleon, praon, and graon levels of matter [4], [10], [15], [17-21].

All matter levels structured by gravitational clustering. This process is accompanied by the opposite process of fragmentation when particles collide with each other and with radiation quanta. In large gas clouds, under appropriate conditions, atoms and molecules can combine under the action of gravitational forces first into molecular complexes and then into more massive dust particles, until planets, stars and their clusters are formed. Dust particles of micron size have a fairly dense core surrounded by a layer of loose matter. The minimum time required for the formation of such particles can be estimated by the approximate formula for the radial fall of matter to the accretion center under the action of gravitation [22]:

 

,                                                          (12)

 

where  is the gravitational constant, and  is the mass density of matter at the initial moment of fall. For example, with a density of  kg/m3 in (12) we obtain a duration of approximately 2.3 hours. The lower the initial mass density of an object is, the longer it takes for such an object to be formed. For a gas cloud with an initial density of  kg/m3, the time  will be approximately  years. If we substitute in (12) the current density of baryonic matter  kg/m3, the corresponding duration of metagalaxy formation will be on the order of 180 billion years.

A more accurate calculation accepted in astrophysics takes into account the time required for a gas cloud to increase its density with decreasing radius instead of taking into account the time of fall into the accretion center. Let us assume that the evolution of matter in the hierarchically structured Universe leads over time to the formation of baryonic matter with average mass density . This process cannot be uniform everywhere, and in those places, where it goes faster, the matter can compress under the action of gravitation, regardless of the surrounding volumes of space with lower density. For acceleration the particles’ motion in the gravitational field outside the gas cloud with the mass , we have:

 

.                                                         (13)

 

This equation (13) is also suitable for describing the motion of the gas cloud’s outer shell. The solution of (13) should be sought in the form ,  .

Hence, it follows that , and if , where  is the initial radius of the cloud, we obtain the relation for the velocity of the shell motion, which is associated with the law of conservation of energy:

 

.                                                 (14)

 

For the case of cloud compression, the coordinate  decreases over time , and therefore, we use the following equation:

 

.                                                 (15)

 

The solution of the differential equation (15), in the case of compression from radius  to radius , is as follows:

 

.

(16)

 

The maximum time is reached when the matter falls onto the point center with the radius . Assuming that , in the case in (16), . This time depends only on the initial mass density  of the cloud and is estimated, since the solution does not consider the pressure forces in the gas cloud, which rapidly increase as the radius decreases.

Considering this approach, two scenarios are possible. In the first of them, the matter of the observable Universe with an average density  arises from praons, the smallest particles of the lowest level of matter, in a period of time determined by the physical conditions of this process. To understand how a nucleon can be formed from a set of praons, it is enough to imagine a similar process, in which a set of nucleons in a large gas cloud is compressed to the maximum extent under the action of gravitation. If the mass of the emerging star is large enough, then the result of its evolution would be a supernova and the birth of a neutron star. Praons, nucleons and neutron stars are similar because they have the highest possible mass densities and the strongest electromagnetic fields at their levels of matter. In this case, it is assumed that at the level of nucleons the particles’ matter is held together not by ordinary gravitation but by strong gravitation [10], [15].

In the second case, baryonic matter is first created; this matter is distributed in space with a certain mass density  and subsequently compressed to density . Let  significantly exceed . By substituting  instead of  and  instead of , and neglecting the first term in (16), we obtain . As an estimate, we will substitute here  kg/m3 instead of  and will obtain the corresponding minimum compression time, if it actually took place:  billion years.

 

For comparison, in the standard cosmological  model, based on the general theory of relativity, the age of the Metagalaxy is estimated to be approximately 13.8 billion years. Moreover, in order to explain the spatial flatness, homogeneity, isotropy and large-scale structure of Metagalaxy, the model includes the hypothesis of cosmological inflation at the early stages of the Big Bang. The exotic character of such inflation is associated with the fact that during a period of time from 10−42 sec to 10−36 sec after the start of the Big Bang at the initial Planck matter density of approximately 1096 kg/m3 the radius of the Metagalaxy should have increased by a factor of 1026 [23]. As can be seen from the estimates made above, if the hypothesis of cosmological inflation is not used, the minimum age of the observable Universe should be an order of magnitude greater than in the  model.

We can consider a typical CMB source as a relativistic uniform system and estimate its internal thermal energy using the virial theorem [24-25]. Considering the contributions of gravitational energy and pressure field energy to the system’s potential energy, according to [26], the following relation is obtained for the kinetic energy :

 

.                                                        (17)

 

However, the energy  can be approximately expressed in terms of the average temperature  of the source:

 

,                                                          (18)

 

where the ratio of the source mass to the nucleon mass in the form  specifies the total number of nucleons  as an estimate of the total number of atoms, and  is the Boltzmann constant.

 

Comparing expressions (17) and (18) for  in view of the relation  gives us the following:

 

.                                                     (19)

 

A primordial gas-dust cloud with mass , which is the source of CMB, can be considered as a blackbody, in which matter is in thermal equilibrium with CMB radiation. The radiation energy density inside the cloud should be equal to . When a typical CMB source is formed in the form of a gas-dust cloud, the binding energy  should be released, which is equal in order of magnitude to the total kinetic energy  of the cloud particles. A more precise estimate in [26] gives . We can assume that the binding energy  is radiated from the cloud by means of CMB radiation. In this case, the following equality must be satisfied:

 

,                                              (20)

 

where  is the cloud’s volume.

 

Substituting  from (18) in (20) and considering the relation , we find:

 

.                                                (21)

 

6. Parameters of CMB sources

Relations (11), (19) and (21) can be considered as a system of three equations to determine unknown quantities ,  and . Substituting  (21) into (19), we get:

 

.                                              (22)

 

Multiplying  (22) by  (21), we find:

 

.                                               (23)

 

Substituting (23) into (11) leads to a quadratic equation for :

 

.                                        (24)

 

Solving equation (24) gives the surface temperature of a typical CMB source:

 

 K.             (25)

 

Substituting  (25) into (22) and into (21), we obtain the radius  of the CMB source in the form of a gas-dust cloud and the density  of the substance of the cloud:

 

 m.                  kg/m3.                  (26)

 

The radius of the cloud in (26) reaches the value  pc.

Next, taking into account (26), we find the mass of the source:

 

 kg or ,                                (27)

 

where  is the mass of the Sun.

 

Parameters (26-27) of a typical CMB source correspond to a rather large gas-dust cloud, the particles of which acquire their kinetic energy due to gravitational work to compress matter. When the particles collide, the energy of motion is converted into heat and can then be radiated in the form of CMB quanta.

If we take into account that the obtained in (26-27) parameters of the sources belong to gas clouds in the early Universe, then we can expect that the first stars appeared precisely in such clouds. Later, similar clouds could give rise to the first open star clusters, which became the main elements of emerging galaxies. For comparison, the number of stars in currently observed open star clusters can be more than one hundred, the typical masses of clusters can exceed , the core’s radius can reach approximately 0.6 pc, and the radius of the corona in a typical cluster can reach 6 pc.

The concentration of CMB sources in the early Universe is found through the density of baryonic matter  and the mass   of a typical source according to the first relation in (11):

 

 m–3.                                               (28)

 

If we assume that each source is located in a certain cubic volume in a cubic lattice, then the shortest distance between the nearest sources will equal  m. This means that the distance between the centers of the nearest sources is  times greater than the radius  of a typical source and is equal to the value on the order of  kpc at  pc according to (26).

The  value of , that is CMB generation power per unit volume of the Universe, is found from (9) taking into account  (25),  (26) and  (28), or from (7) taking into account the relations , :

 

 W/m3.                           (29)

 

The values of  may differ slightly in different directions, reflecting the variability of the Hubble parameter and the spatial matter distribution.

The average concentration of nucleons in the Universe is  m–3. Taking this into account, from (29) the power of CMB energy generation per nucleon of the Universe is determined:

 

 W/ nucleon.                                            (30)

 

Dividing the binding energy  of one SMB source by the number  of nucleons in this source, taking into account expressions  (18) and  (25), we find the binding energy per nucleon:

 

 J/ nucleon.                                  (31)

 

On the other hand, an estimate of the photon’s concentration in the volume of a CMB source in a state of temperature equilibrium between radiation and matter at the temperature  K is obtained as  m-3, where

 

 J/(K·m3)

 

is the volumetric density of the CMB entropy and the coefficient   

Dividing the photon energy density (20) by the photon concentration , we obtain the average energy per photon:

 

 J/photon.                                     (32)

 

Note that the binding energy per nucleon  in (31) and the energy per photon  in (32) are close to each other in magnitude. After the photons leave the CMB sources, fill outer space and reach the Earth, their average temperature will decrease from value  K to value  K. In this case, the energy of a photon with a frequency of  GHz corresponding to the maximum in CMB radiation at temperature  K is equal to  J.

Hence, the ratio of the number of CMB photons in cosmic space to the number of matter nucleons present in this space should be on the order of unity. On average, we can assume that each nucleon of the observable Universe produces only one CMB photon.

In the course of our calculations, we assumed that all the nucleons present in the Universe with an average density of  kg/m3 were compressed by gravitation into primordial gas-dust clouds with an average density of  kg/m3 (26). These clouds play the role of typical CMB sources. Let the volume of a typical source be denoted by  and the volume of the same, but not compressed matter in the homogeneous Universe with density  and with the same mass  (27) be denoted by . Then, the ratio of the volumes equals . Now, in view of  (18), the binding energy  of one source, and the number of nucleons  in the source, we can estimate the average CMB energy density in the Universe in the following form:

 

 J/m3.     (33)

 

When deriving relation (20), we use the expression . Combined with (33) and the relation , this gives the following:

 

.                                                (34)

 

In (34), a significant difference is obtained between the averaged CMB energy density  in (33), and between the photon energy density  in the case of thermal equilibrium of photons with the matter of CMB sources. The difference in magnitudes of  and  results from the fact that the CMB generated in the volume  of each source was in equilibrium with the matter only in this volume. When the CMB from each source fills the volume  and starts mixing with the radiation from nearby sources, the CMB energy density decreases from  to . As a result, the SMB observed on Earth is thermal radiation, the energy density of which in the Universe. is .

In  model, the difference in quantities of  and  is not taken into account, and it is assumed that the energy density of the СМВ is equal to  J/m3 in the entire space of the Universe at temperature  K of СМВ.

In this case, the estimate of the CMB photon concentration in the form  m-3 applies to the entire Universe. Then the ratio of the number of CMB photons to the number of nucleons will equal , which is close in magnitude to the ratio of the volumes  in (34).

 

Hence, the following question arises: why is the number of photons so much greater than the number of nucleons? This problem, known in cosmology as the entropy problem, is usually solved via the concept of the hot Universe based on the assumption of adiabatic space expansion from the initial state of equilibrium of radiation and matter.

In contrast, in our approach the numbers of СМВ photons and nucleons are approximately the same, and there is no need for the hot Universe. Since the SMB is currently not in equilibrium with matter, the formula for energy density  cannot be applied to the entire Universe.

 

Indeed, the primordial gas-dust clouds, which were the sources of CMB in the early Universe, were located in a discrete way, occupied a small volume and therefore could not play the role of a global black body, limiting the volume of the Universe.

 

7. The angular harmonics of CMB

Using the Fourier transform, the observed CMB power spectrum can be expanded to include spherical harmonics [27-28].

The spherical harmonic  in the angular power spectrum corresponds to the average value of the CMB temperature. The dipole anisotropy on the CMB temperature distribution map has an amplitude of approximately 0.1% and is related to the spherical harmonic  [29]. The dipole anisotropy is well explained by the Doppler effect and by the motion of the Earth together with the Sun relative to the reference frame, in which the CMB intensity is the same in all directions. This motion changes the CMB radiation wavelength measured on Earth, depending on the angle between the Earth’s total velocity in cosmic space and the direction of the sky region from which the CMB originates.

The spherical harmonics  are related to CMB temperature fluctuations, the root-mean-square deviation of which reaches several tens of μK relative to the average temperature. The  model assumes that such temperature fluctuations could be caused by fluctuations in the density of matter in the early Universe, which had the state of very dense hot plasma of electrons and baryons.

One alternative explanation is that the angular power spectrum of the CMB can be obtained if CMB photons, upon their appearance, interact with matter, which was structured into some objects, clusters and particles [30]. The average distance between the centers of the objects in the case of their cubic arrangement is approximately 108 m, the mass of one object is  kg, and the mass density of the object is  kg/m3. Similarly, there are clusters inside the objects, the distance between the centers of which is about 12 cm. If their mass density is  kg/m3, then the cluster mass is  kg. The position and amplitude of the main peak of CMB power spectrum at  and of the subsequent peaks depend mainly on the mutual distances between the mentioned objects, and on their mass density and internal structure.

It is assumed that the cluster contains 40 to 100 particles, such as protons, helium nuclei and electrons; therefore, it represents an atomic-molecular complex, containing hydrogen and helium. On average, an object contains approximately  clusters. The results obtained for the structure of objects, clusters and particles were found under the condition of using a radiation wavelength equal to 1.9 mm. This wavelength corresponds to the maximum blackbody spectrum distribution at the temperature  K and most exactly reflects the properties of CMB from the standpoint of structural analysis. Moreover, the angular power spectrum of CMB radiation is the same for all wavelengths of the CMB.

The presented parameters can be combined with the described scheme of CMB emergence in the early Universe, in which matter evolution first leads to formation of nucleons and electrons. Then gravitation compresses the matter into gas-dust clouds and sets the matter particles in motion. When the particles collide, the kinetic energy is converted into thermal energy and is radiated in the form of CMB photons. The mass density of objects in [30] is less than the mass density of gas clouds  kg/m3, as found in (26). We can assume that the objects in [30] were located in the less dense part of the shell of gas clouds. Then, CMB photons, passing through these objects, clusters and particles inside them, can form the currently observed angular radiation power spectrum.

The possibility that these objects, clusters and particles could appear in primordial gas clouds follows from the value of the Jeans mass [31], which can be simplified as follows:

 

.                                             (35)

 

The temperature  in (35) must be specified in K, and the particle concentration  must be specified in .

Let us substitute in (35) the cloud surface temperature  K (25) instead of , and take into account  kg/m3 (26) and the concentration of cloud particles m-3 instead of . This gives . The Jeans mass is less than the gas cloud mass  (27), which allows fragmentation of the cloud into smaller structural components.

The nonuniform distribution of matter in cosmic space also contributes to the small-scale fluctuations in the CMB temperature. Thus, correlations between the optical radiation of galaxies and CMB fluctuations are described in [32], and for radio sources, such correlations are presented in [33]. The cold anomalies in CMB temperature are mysterious and cannot be explained from the standpoint of the  model, the most famous of which is the WMAP cold spot discovered by the WMAP space observatory in the Eridanus constellation [34-35]. The cold spot is approximately  µK colder than the CMB temperature,  K.

These anomalies can be explained as follows. Since  for CMB, in the first approximation, we have . If we direct the radiation receiver exactly to the anomalous spot, then in (6), we can set ,  , and we can write the following:

 

.                              (36)

 

According to (7) and considering the relation , we find:

 

,                        .                      (37)

 

 

 

Substituting  (37) into the expression for  (36),  we find the relationship between the temperature difference , the distance  and the volume  generating CMB radiation and leading to the contribution  to the CMB temperature :

 

.                              (38)

 

Equation (38) assumes that the volume  contains primordial gas-dust clouds functioning as CMB sources, which, on average, have the mass density  kg/m3 (26) and the concentration  m–3 (28) in the early Universe. In this case, the concentration  is present in (38) in two terms. An increase  in the term  leads to an increase of , but the term  acts in the opposite way, reducing . Thus, if in some direction in the volume  the concentration of sources differs from the value  due to some anomaly, then this will lead to a change of  in (38).

We can see from the relation  that if the mass  of a typical CMB source is constant, then the change in the concentration of sources  can be associated with a local change in the mass density of baryons  in the volume  under consideration. Thus, fluctuations in the mass density  in cosmic space can influence fluctuations in the measured CMB temperature in various directions.

According to (8), the redshift  in the model under consideration can be related to the distance   by the formula: . As an example, let us place a certain volume  at a distance corresponding to , that is, at  Gpc. Let us assume that equal to 20 μK, which is close to the value of the root-mean-square small-scale CMB fluctuations. Using further the relation , the values of  m (26) and  m–3 (28), from (38) we find  m3, which for a spherical volume gives the radius of this volume of the order of  Mpc. Such the radius is close to the radius of the known Giant Void in the constellation Canes Venatici [36]. Consequently, the presence of voids in accordance with (38) leads to the observed CMB fluctuations.

It is known that, for sufficiently large spherical harmonics  the relation  holds true, where  is the effective sky viewing angle [28]. The main peak in the CMB angular power spectrum occurs at , which corresponds to the angle . Moreover, if the harmonic number  and  decreases, and the angle  and  increases, the power in the angular spectrum decreases gradually without any particular peaks. Why do harmonics with small  manifest in the spectrum in a different way than harmonics with large , which form the spectrum in the form of sinusoid damping in amplitude?

For the above example with the volume , let us calculate the angle  in radians using the formula: , and the angle in degrees . The angle  in radians corresponds to the spherical harmonic  in the CMB angular power spectrum. It turns out that supervoids with a low density of matter or, on the contrary, denser regions of space can make a significant contribution to CMB temperature fluctuations only at small . As for the appearance of spherical harmonics with large values  in the power spectrum, in the model presented above, according to [30], they are explained by the fact that CMB radiation interacts with matter, which is structured into some objects, clusters, and particles. Thus, different mechanisms lead to different forms of CMB power spectrum for small and large spherical harmonics. In contrast, the  model has difficulties explaining the low power and form of the angular spectrum for harmonics associated with large angles  and with small  [37].

 

8. Infrared and optical background radiation

The dependence of the angular intensity  on the cosmic background radiation frequency in [9] shows that there are other angular intensity peaks near the CMB, including those of the cosmic infrared background (CIB) and the cosmic optical background (COB). The total intensity of CIB and COB radiation is almost 10 times less than the intensity of cosmic microwave background radiation (CMB).

It is believed that the main contribution to CIB and COB comes from the processing of radiation from protostars and young stars by cosmic dust. We can make this assumption more concrete. Let us apply the obtained results with respect to the CMB to estimate the parameters of space objects, which could produce CIB and COB radiation.

We can assume that the maximum  for the CIB is obtained at a radiation frequency of  Hz, and for the COB the maximum occurs at a frequency of  Hz. As a first approximation, let us assume that the Wien displacement law for radiation from a black body is valid for the radiation frequency. This gives the corresponding radiation temperatures  К and  К.

Substituting temperatures  and  in (25) instead of temperature  makes it possible to estimate the surface temperatures of CIB and COB sources in the early Universe:

 

 K.                      K.                        (39)

 

Substituting temperatures (39) into (21-22) instead of , we obtain the corresponding mass densities and radii of CIB and COB sources. We can also estimate the masses of sources by multiplying the mass density and the volume of the corresponding source:

 

 kg/m3.        m.        kg.          (40)

 

 kg/m3.           m.           kg.             (41)

 

According to (40), the sources of CIB radiation are gas-dust clouds with a radius of the order of  AU. and with mass . For comparison, in the Solar System the dwarf planet Sedna at aphelion moves away from the Sun at a distance of 937 AU. From (41) it follows that COB radiation sources are objects with mass  and with a radius of the order of  , where  is the radius of the Sun.

In (26) and in (27) it was found that a typical CMB radiation source has a radius of  pc and a mass of the order of. . The sources of radiation CIB and COB in (40-41) also have masses of the order of . It turns out that during cosmological evolution, CMB microwave radiation sources first become isolated in the form of gas clouds with a radius of the order of  pc. When these clouds are subsequently compressed by gravitational forces to a radius of the order of AU, protoplanetary systems containing gas and dust arise, leading to infrared background radiation CIB. The compression of clouds slows down due to the appearance of pressure in the gas, and the process of planet formation begins in the clouds. At the same time, the bulk of gas and dust in the center of each cloud continues to compress. As a result, primordial stars emerge, producing optical background radiation COB. Nuclear reactions begin in the depths of these stars, preventing the gravitational compression of matter. Thus, the CMB, CIB and COB emissions are associated with the most long-term and equilibrium phases in the evolution of primordial gas-dust clouds.

Since the masses of CIB and COB sources approximately coincide with the mass  (27) of CMB sources, the concentration of CIB and COB sources in the early Universe approximately coincides with the concentration  m–3 (28) of CMB sources. Due to their large masses, primordial stars that are the sources of COB should transform into neutron stars. Thus, the concentration  can be considered as the concentration of primordial neutron stars. The average distance between such stars can be estimated using the formula  m or  kpc. On the other hand, the observable Universe has a volume of the order of  m3, which contains about  stars [38]. The concentration of stars in the Universe is on the order of  m–3. Comparing the concentration of all stars with the concentration of primordial neutron stars leads to the fact that there are about  ordinary stars per a neutron star. This ratio of stars is indeed confirmed by observations.

Modern instruments allow us to measure angular power spectra not only for CMB, but also for CIB radiation [39]. Thus, the methods for analyzing the structure of radiating objects, developed in [30] for CMB, can also be applied to CIB radiation. According to [30], the mass density of the medium, which contains objects, clusters, and particles and is responsible for the appearance of CMB angular harmonics, equals  kg/m3. This mass density does not exceed the mass density in (40-41) of the objects, which can be the sources of CIB and COB radiation. This implies the possibility that the cause of harmonics in the CMB and CIB power spectra may be the same objects, clusters and particles located in the shells of the corresponding gas-dust clouds at different stages of compression of these clouds.

In (34) it was shown that the formula for the energy density of СМВ  J/m3 (20), where  K is the temperature of СМВ sources in the early Universe, cannot be applied to the entire Universe. Instead of , a significantly lower average volumetric energy density of the CMB was calculated, equal to  J/m3 according to (33). This was because the gas mass  occupying the volume  in (34) in the initially homogeneous Universe with the mass density , only after being compressed into a gas cloud with a volume  and density . would start radiating like a black body with the temperature K. As СМВ photons move through space, their energy decreases due to cosmological redshift. In addition, photons interact with the matter of many СМВ sources and are partially scattered. As a result, the intensity of the СМВ radiation decreases, and the spectrum of СМВ photons becomes close to the observed spectrum of the radiation of a black body with temperature  K.

For CIB and COB radiation the situation is largely similar. As in the case of CMB radiation, CIB and COB radiation are nonequilibrium and for them there is no global blackbody consisting of matter and bounding the entire Universe. This means that in fact we always observe discrete sources of radiation, which at large distances merge into an almost uniform background.

 

9. Discussion of results

A well-known problem of the Big Bang theory in cosmology is the complete lack of understanding of the nature of such an explosion and of the origin of matter as such. The subsequent use of the general theory of relativity in the  model adds new problems, such as singularities and metric space expansion, which are incomprehensible from the perspective of physics, the appearance of unidentified dark matter and mystical dark energy. The use of multiple fitting parameters in the  model further undermines the credibility of the modern version of the Big Bang theory.

In [40], six fitting parameters are listed, and it is concluded that despite the accuracy of the results’ fitting, it is still not enough to consider the  model correct. In [13], the following conclusion was reached: ”However, in cosmology, it has unfortunately been the case that even a long series of failed predictions has not generally led to the rejection of theories, but rather to their unlimited modification with ad hoc hypotheses, such as inflation, non-baryonic matter, and dark energy.”

It is noted in [41] that it could be possible to improve the situation with predictions in the  model if, in addition to the seven fitting parameters of the model, we would assume, for example, the existence of early or dynamical dark energy, neutrino interactions, cosmological models with additional interactions, primordial magnetic fields, modified theories of gravitation, etc.

On the other hand, cosmology in the theory of infinite hierarchical nesting of matter finds the source and cause of origin of matter and the forms of its existence in the uniform evolutionary process of transformation of the main carriers at all matter levels [15]. This means, for example, that the evolution of the matter of planets and stars at the stellar level of matter is due to the evolution and action of carriers belonging to lower matter levels. Each matter level has its own main carrier as the most stable and balanced object, such as a neutron star, nucleon, praon, graon, etc., respectively. The similarity principle assumes the existence of the same coefficients of similarity in mass, size and speed of processes between the respective objects of the adjacent matter levels, which allows us to find the physical parameters of the main carriers of matter. As a consequence, a neutron star contains as many nucleons as each nucleon contains praons, and as each praon contains graons.

The main driving forces for matter evolution are electromagnetic and gravitational forces, which can be reduced to the action of carriers of the lowest matter levels, moving at relativistic speeds [10], [42-46]. This point of view is supported in [47] by the fact that the evolution of matter in the early Universe turns out to be little dependent on external factors and is determined mainly by internal factors.

It follows from the principle of similarity of matter levels that the analogs of a neutron star at the nucleon level of matter are nucleons, and the analogs of white dwarfs are the so-called nuons [4], which have the same mass range as nucleons. Nuons are similar in their properties to muons, but the origins of these particles are different: nuons appear similar to white dwarfs in the course of long-term evolution of matter, and muons appear mainly in the rapid decay of pions, while pions are assumed to be the analogs of low-mass and therefore unstable in the decay of neutron stars. Moreover, neutral nuons play the role of dark matter, which manifests itself through gravitational effects both on the motion of stars and gas clouds inside galaxies, and on the motion of galaxies themselves during their interaction [48]. In contrast, the  model has difficulties explaining dark matter, describing its evolution and origin.

The CMB generation process continues to occur today, although on a smaller scale. The properties of the coldest dark nebulae with masses up to  are quite close to those of primordial gas-dust clouds. Thus, practically opaque Bock globules, which are distinguished by their black color, have a temperature in the range from several degrees to 30 K and a typical mass of up to . From the standpoint of thermal radiation, such objects can model the properties of a blackbody quite well. Here, we provide as examples references to the spectra of the infrared sources IRS 1 and IRS 2 in [49-50] and to the spectrum of the Bock globule B335 in [51].

One review [52] described the properties of 248 small molecular clouds, most of which are Bok globules. It is assumed that in our Galaxy system the average distance between such globules is 600 pc, and the average mass of a globule is approximately . This distance can be compared with the value  kpc found for the distance between the primordial gas-dust clouds of the early Universe through the concentration  of CMB sources in (28).

According to [52], for most globules the radiation temperature of gas does not exceed 4.5 K, and the kinetic temperature does not exceed 8.5 K. Since globules are heated by radiation from the surrounding star background, the dust temperature in globules turns out to be higher than the gas temperature and depends on the measured frequency band and on the size of the dust particles. On average, the dust temperature is close to 25 K. Under such conditions, the spectrum of some globules appears to be not the blackbody spectrum at one fixed temperature, but rather the sum of the spectra of individual components consisting of gas and dust.

In [53], by analyzing the absorption lines of water molecules in a large cloud of water vapor near the HFLS3 galaxy, it was found that the temperature required for this exciting radiation ranges from 16.4 to 30.2 K. Since the HFLS3 galaxy has a redshift of the order of magnitude  and is located sufficiently far away, this temperature is considered from the point of view of the  model as the CMB temperature at an earlier time. Moreover, due to the space expansion since then, the CMB temperature should have decreased to the current value of  K.

On the other hand, radiation at a temperature ranging from 16.4 to 30.2 K is quite typical for gas clouds and Bok globules under the action of radiation from surrounding stars, including those in the most distant galaxies. In the model we are considering, the CMB temperature at the moment of emission coincides with the temperature  K (25) of gas-dust clouds with masses on the order of , so distant from us that their redshift is much greater than the redshift of the observed galaxies.

How does the CMB radiation spectrum almost exactly correspond to the blackbody spectrum? Here, the following circumstances can be taken into account. First, we assume that there were no stars around the primordial gas-dust clouds of the early Universe that could noticeably heat the clouds and influence the form of the clouds’ spectrum. Then, the spectrum of each cloud could be sufficiently close to the spectrum of a blackbody with the temperature  K.

Another circumstance is associated with the size of the visible Universe. Substituting in (8) the maximum measured value of redshift  for the CMB according to [54] at  km/(s·Mpc), we find the radius of the visible Universe  m or 30 Gpc. Light can travel this distance in  billion years. This time is less than the minimum compression time  billion years, which was found according to (16) for the compression of all baryonic matter during the formation of the visible Universe.

It should be noted that when measuring CMB intensity, it is necessary to exclude radiation from bright point sources such as clusters of stars and galaxies from the obtained data to determine the background radiation precisely. However, the redshift of the most distant observable galaxies does not exceed . For example, the redshift of the galaxy GN-z11 equals  according to [55]. This redshift is significantly less than the redshift of the CMB, which reaches . Thus, CMB radiation travels the main part of its way in unexplored distant regions of cosmic space.

In (6-7) the fact was used that the cross sections of CMB sources in the early Universe and the concentration of sources are such that at very large distances, these cross-sections begin to overlap each other; and, therefore, the Beer–Lambert law becomes valid. As a result, the CMB radiation coming to the Earth from distant sources has enough time to interact with the matter of multiple closer sources and additionally thermalize. This approach inevitably turns the CMB spectrum into an averaged spectrum that is close to the equilibrium spectrum of a blackbody.

The presented model is consistent with the results in [56], where the so-called virial gas clouds located in the halo of galaxies make it possible to explain the rotational anisotropy observed in the CMB. In [57], within the framework of the standard model of the expanding Universe, the evolution of virial clouds from the surface of the last scattering to the formation of primordial stars of population III was considered. These virial clouds, which are also in thermal equilibrium with the CMB, as in our approach, have almost the same density as the primordial gas-dust clouds in our model. Thus, the conclusions in [56-57] concerning primordial gas-dust clouds prove our calculations.

The Earth and the Sun are known to move relative to the reference frame, in which the CMB is isotropic, at a speed of approximately 370 km/s. If we take into account the motion of the Sun in our galaxy and its motion in the Local Group of Galaxies, then the speed of the Local Group of Galaxies relative to the CMB’s isotropic reference frame will be about  km/s [58]. In the  model, the cosmological redshift is interpreted as a result of the Universe expansion, which has the mathematical meaning of a change in the spacetime metric, caused by an unknown factor. The physical meaning of this space expansion is an obvious subject for discussion regarding the justifiability of the use of mathematical hypotheses in the real physics of phenomena. It is assumed that at large distances from the Earth, galaxies and other objects, located there, are moving away from each other at tremendous speeds due to space expansion. These speeds can significantly exceed the speed  of motion of the Local Group of Galaxies relative to the isotropic reference frame of the CMB. So why from the entire speed spectrum do we observe a relatively small speed , is it by chance?

From the viewpoint of the theory of infinite hierarchical nesting of matter, the answer lies in the fact that, for matter evolution and for the emergence of a new matter level with more massive objects, neither the Big Bang, nor the metric expansion of spacetime or high speeds of motion are needed. The deviation of the speed of galaxies and star clusters from the speed of the CMB’s isotropic reference frame can be caused only by the gravitational action of galaxies on each other. When averaging the matter’s speeds over the volume of the visible Universe, the obtained average speed must coincide with the speed of the CMB’s reference frame because CMB occurs in the early Universe and, on average, is stationary relative to the global distribution of matter.

Taking this into account, the problem of space flatness on cosmological scales becomes understandable when even at very large distances, spacetime is practically not curved. Therefore, there is no great need to calculate any curved metric, which is always needed in the general theory of relativity, even in flat Minkowski spacetime. In this case, instead of the general theory of relativity, it is more convenient to use the covariant theory of gravitation [59-60], in which the metric effects are separated from the gravitational effects. This means that gravitation does not depend on a metric; rather, it is a real physical force, such as the electromagnetic force, which exists even in Minkowski spacetime, when there is no spacetime curvature.

Paradoxes arising from the concept of space expansion were analyzed in [61], such as the violation of the law of conservation of energy for local comoving volumes, the Newtonian form of Friedmann's equations, the superluminal velocities of distant galaxies as a result of space expansion, and Hubble's law in inhomogeneous distributions of galaxies, etc. The main reason for the appearance of such paradoxes is the general theory of relativity due to the absence of the energy-momentum tensor of the gravitational field in this theory, which casts doubt on the possibility of using this theory in cosmology.

It was noted in [62] that the time scale in the  model does not correspond to the time, which was required for the formation of large galactic clusters and voids in the early Universe. In this regard, it is assumed that this discrepancy may be due to the use of the general theory of relativity, which should be replaced with another gravitation theory, for example, modified Newtonian dynamics (MOND). The authors of [62] draw the following conclusion from their article: at the present moment, we understand neither the distribution of matter and energy in the Universe nor the law of gravitation, which governs this.

It was found in [63] that a supercluster of galaxies with a radius of about 6 Mpc rotated at an angular velocity  equal to  degrees per 10 billion years, or  s-1. According to [64], large galactic clusters with sizes on the order of  Mpc can experience general motion at velocities up to   km/s. Assuming that this motion arises from rotation, for the angular velocity in the first approximation, we have  s-1. The large-scale structure of the Universe has the form of a cosmic web and consists of individual filaments that contain galactic clusters. The difference  in the linear velocity of rotation of different points in the filaments can reach 100 km/s at a distance  between the points equal to 1 Mpc, which gives an estimate of the angular velocity of rotation  s-1 according to [65].

If we assume that the entire visible Universe also rotates, then its limiting rotation can be estimated by the formula for the first cosmic velocity, assuming that the matter at the edge of the Universe is in equilibrium between the gravitational force and the centripetal force:

 

.

 

where ,  and  denote the mass, radius and mass density of the Universe, respectively. Substituting here the mass density  kg/m3 instead of , we find  s-1, which has the same order of magnitude with respect to the rotation of large galactic structures. This rotation corresponds to a period of approximately 830 billion years.

It is obvious that any general rotation of the observable Universe contradicts the Big Bang since, due to rotation the Universe would have a nonzero angular momentum. In the scenario of the Big Bang and subsequent inflation up to the state of the observable Universe, it turns out that, taking into account the law of conservation of angular momentum, the object that gave rise to the Universe should have had an enormous angular momentum for its small size, which seems completely improbable. At the same time, in the hierarchical model, the object, from which the early Universe was formed could consist of a huge cloud of praons. If this cloud with the sizes of the order of the observable Universe had any general rotation, then the emerging Universe would have the same rotation after the evolution of praonic matter and its transformation into nucleons and nuons.

We believe that other, less complex cosmological problems can also find their solution within the framework of the theory of infinite hierarchical nesting of matter and a stationary Universe. For example, in [66] it is indicated that expansion of space is not required to explain the change in luminosity in the spectra of supernovae. Thus, cosmology can be constructed with a minimum of assumptions and paradoxical conclusions that contradict the traditional logic of physics.

 

10. Conclusions

Cosmic microwave background radiation (CMB) along with the effect of the cosmological redshift of radiation spectra are usually considered phenomena that find an acceptable explanation within the framework of the Big Bang theory. Indeed, these phenomena are rather difficult to explain, which eventually led to the idea of the Big Bang. However, due to the significant drawbacks of this theory, which are described above, we consider this theory to be too exotic and radical and suggest another explanation for emergence of CMB.

In our approach, the necessary source of CMB energy turns out to be gravitational energy, which, under matter clustering in primordial gas-dust clouds in the early Universe, is released in the form of the kinetic energy of motion of matter particles, according to the virial theorem. The subsequent collisions of particles convert kinetic energy into thermal energy, heating the particles, so that gas-dust clouds can radiate as black bodies at the temperature  K (25). During the time until CMB radiation from distant regions of the Universe reaches the Earth, the temperature of this radiation decreases to the value  K.

Based on this approach, we first find formula (7) for the volumetric power  of CMB energy generation in cosmic space, and then we find the main characteristics of primordial gas-dust clouds, including their radius  pc (26), mass  (27), volume concentration of clouds  m–3 (28) and distance between neighboring clouds  kpc. For the volumetric power  of CMB energy generation, the value  W/m3 (29) is obtained, while the generation power per nucleon of a typical gas-dust cloud, as well as per nucleon in the early Universe, is equal to  W/nucleon (30).

We can conclude that the CMB originated as thermal radiation from primordial gas-dust clouds. This thermal radiation could interact with a large number of particles in each cloud, which, in view of the slowly changing equilibrium state of the clouds and their opacity and weak reflection, provides the CMB radiation spectrum close to that of blackbody radiation. In addition, CMB radiation coming from very large distances passes through many separate CMB sources in the form of gas clouds on its way to Earth. This further contributes to the transformation of the CMB spectrum into a blackbody spectrum.

As indicated in Section 6 with reference to [30], the angular harmonics in the CMB power spectrum can be explained if we take into account matter clustering near the surface of primordial gas-dust clouds. This possibility is supported by the presence of both small and large dust particles observed in Bok globules, leading to significant polarization of radiation in the millimeter range [67-69] up to values on the order of 10 % or more. In this regard, the degree of polarization of the CMB is also approximately 10 %. Thus, the primordial gas-dust clouds generating CMB during their evolution could take the form of globules.

In addition to CMB, the approach under consideration can be applied to infrared background radiation (CIB) and optical background radiation (COB). The estimates made in Section 7 give reason to believe that the CIB emission could have originated in protoplanetary clouds, while the contribution to the COB emission was made by primordial stars.

Although the blackbody CMB radiation coming to the Earth from all directions has an intensity , this does not mean that the ubiquitous occurrence of CMB energy density in cosmic space is equal to  J/m3, similar to blackbody radiation. As shown in (33), the average CMB energy density in the Universe should equal  J/m3. This happens because the CMB is radiation that is not in equilibrium with the global blackbody. Indeed, all CMB sources cannot form a closed surface entirely surrounding the radiation of the Universe, which is a necessary condition for the validity of the formula . The same applies to CIB radiation and COB radiation, which are also nonequilibrium.

Due to the difference between the energy density  and the energy density  (20) of blackbody radiation, it becomes possible to move away from the model of the hot expanding Universe. It follows from this model that the CMB energy density is equal to  everywhere, so that the ratio of the number of photons to the number of nucleons is equal to , which is close in magnitude to the ratio of volumes  in (34). In our approach, the energy density  corresponds to the condition of practically the same number of photons and nucleons, which does not lead to the problem of excess photons over nucleons or to the need to introduce the hot Universe model.

 

Statements and declarations

The authors have no relevant financial or non-financial interests to disclose.

 

Data availability

The data underlying this article are available in the article and in its online supplementary material.

 

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