Strong (nuclear) gravitation
In Astronomy the only one available characteristic empirical physical constant is the gravitational constant. Without completing the charge-mass unification or final unification: one cannot say, whether it is an ‘input to the unification’ or ‘output of unification’. The same idea can be applied to the atomic physical constants also. Sitting in a grand unified roof one cannot make an ‘absolute measurement’ but can make an ‘absolute finding’. Up till now, no atomic model has implemented the gravitational constant in the atomic or nuclear physics. Then, whatever may be its magnitude, measuring its value from existing atomic principles is impossible. Its value has been measured in the lab only within a range of 1 cm to a few metres, whereas the observed nuclear size is 1.2 fermi. Until one measures the value of the gravitational constant in microscopic physics, the debate of strong (nuclear) gravitation can be considered positively. The idea of strong gravitation originally referred specifically to mathematical approach of Abdus Salam of unification of gravitation and quantum chromodynamics, but is now often used for any particle level gravitation approach. Now many persons are working on this subject. The main advantage of this subject is: it couples black hole physics and particle physics.
Strong gravitational constant
The strong gravitational constant, denoted or , is a grand unified physical constant of strong gravitation, involved in the calculation of the gravitational attraction at the level of elementary particles and atoms.
According to Newton's law of universal gravitation, the force of gravitational attraction between two massive points with masses and , located at a distance between them, is:
The coefficient of proportionality in this expression is called gravitational constant. It is assumed, that in contrast to the usual force of gravity, at the level of elementary particles acts strong gravitation. In order to describe it in the formula for gravitational force must be replaced on :
The dimensions assigned to the strong gravitational constant may be found from the equation above — length cubed, divided by mass and by time squared (in SI units, metres cubed per kilogram per second squared).
There are several ways to assess the value of . J. Dufour, under the assumption that the strong gravitational constant depends on the type of objects, from the interaction of two deuterium nuclei determined,  that .
Based on the analogy between hadrons and Kerr-Newman black holes  Sivaram, C. and Sinha, K.P,   and Raut, Usha and Shina, KP  accepted value .
This value of the strong gravitational constant allowed estimating the strong spin-torsion interaction between spinning protons. 
In paper of Mongan  strong gravitational constant is .
According to Robert Oldershaw  value of the strong gravitational constant is .
As in Oldershaw’ paper, strong gravitational constant could be related  with the proton radius , the proton mass and the speed of light :
According to Tennakone who identified the electron and the proton as black holes in the strong gravitational field, strong gravitational constant is: 
Recami et al   define strong gravitational constant through the mass of the pion as follows:
where – Planck constant.
From this they derive constant of strong interaction of two nucleons in the following form: 
, where indicates a strong charge, is reduced Planck constant.
Stanislav Fisenko et all found   a spectrum of steady states of the electron in proper gravitational field (0.511 MeV …0.681 MeV) on the base of strong coupling constant
U. V. S. Seshavatharam and S. Lakshminarayana  in determining repelled from the Fermi constant, which led them to the value .
In the paper  strong gravitational constant equal to .
Sergey Fedosin entered the strong gravitational constant in 1999 on the basis of equality between the Coulomb electric force and gravitational force in the hydrogen atom on the Bohr radius. This leads to the following expression for the value of the strong gravitational constant: 
where – elementary charge, – pi, – vacuum permittivity, – the mass of proton, – the mass of electron.
The small mass and large charge of matter do not allow the electron to be entirely in some small volume near the nucleus, and it gets disklike axisymmetric shape, which is limited by size of atom. In the hydrogen atom electrical forces between the nucleus and matter of the electron are attractive, but they are compensated by the repulsion of the intrinsic charge of the electron. There are the centripetal force of rotation of the electron around the nucleus, and the gravitational attraction between massive nucleus and matter of the electron. From here follows that the action of strong gravitation between the masses of nucleus and electron on the one hand, and the electric force between charges of the nucleus and the electron, on the other hand, allows to estimate the value of .
With the help of the constant the rest energy of proton is equal to half of energy of strong gravitation in accordance with virial theorem: 
where m is the proton radius, (in the hypothetical case of a uniform mass density of the proton in the form of a ball must be ). This implies that the mass of nucleons is determined by the energy of the strong gravitation according to the principle of mass–energy equivalence.
If we assume that the magnetic moment of the proton is created by the maximum rotation of its positive charge distributed over the volume of the proton in the form of a ball, when the centripetal acceleration at the equator becomes equal to acceleration of strong gravitation, the formula for the magnetic moment is as follows:
where J / T is the magnetic moment of the proton, (in the case of uniform density and charge should be ).
From the formulas for the energy and the magnetic moment the radius of the proton is determined in the self-consistent model. 
The strong gravitational constant is also included in the formula describing the nuclear force through strong gravitation and gravitational torsion field of rotating particles.  A feature of the gravitational induction is that if two bodies rotate along one axis and come close by the force of gravitation, then these bodies will increase the angular velocity of its rotation. In this regard, it is assumed that the nucleons in atomic nuclei rotate at maximum speed. This may explain the equilibrium of the nucleons in atomic nuclei as a balance between the attractive force of strong gravitation and the strong force of the torsion field (of gravitomagnetic forces in gravitoelectromagnetism). In particular, the coupling constant is
where is equal to 0.26 for the interaction of two nucleons, and tending to 1 for bodies with a lower mass density.
The constant is close to coupling constant of strong interaction of two nucleons in Standard Model
, where is the constant of the pseudoscalar nucleon-pionic interaction.
Fine-structure constant is coupling constant of electromagnetic interaction and may be written so:
Role of squared Avogadro number
Considering Avogadro number as a scaling factor, U. V. S. Seshavatharam and S. Lakshminarayana finally arrived at a value of    . It is noticed that in Hydrogen atom, ratio of total energy of electron and nuclear potential is equal to the electromagnetic and gravitational force ratio of electron where the operating gravitational constant is nothing but the atomic gravitational having a value N2G. This is a direct confirmation of the existence of the atomic or nuclear gravitational constant in nuclear physics. Therefore, this subject can now be considered as part of the mainstream research in quantum gravity.
The central idea is: for mole number of particles, strength of gravity is and force required to bind particles is Force required to bind one particle is By considering this force magnitude as the characteristic weak force magnitude, it is observed that, where is the rest mass of proton and is the rest mass of electron. Obtained value of Here the most important point to be emphasized is can be considered as the classical or upper limit of gravitational or electromagnetic force. It can be considered as the grand unified force. It is the origin of Planck scale and of the black hole astrophysics.
Connection with usual gravitational constant
With the help of similarity of matter levels and SPФ symmetry in Theory of Infinite Hierarchical Nesting of Matter the value of can also be defined in terms of coefficients of similarity and gravitational constant:
where , , are the coefficients of similarity in mass, size and speed, respectively, for the degenerate quantum objects at the atomic and stellar levels of matter. The powers of similarity coefficients in this equation correspond to the dimension of gravitational constant according to dimensional analysis.
From the standpoint of Infinite Hierarchical Nesting of Matter and Le Sage's theory of gravitation, the presence of two gravitational constant and shows the difference between the properties of gravitons and properties of matter at different levels of matter.  
Note that in the atomic or nuclear physics, till today no one measured the gravitational force of attraction between the proton and electron and experimentally no one measured the value of the gravitational constant. Physicists say – if strength of strong interaction is unity, with reference to the strong interaction, strength of gravitation is 10−39. The fundamental question to be answered is: is mass an inherent property of any elementary particle?
One can say: for any elementary particle mass is an induced property. This idea makes grand unification easy. Note that general relativity does not throw any light on the ‘mass generation’ of charged particles. It only suggests that space-time is curved near the massive celestial objects. More over it couples the cosmic (dust) matter with geometry. But how matter is created? Why and how elementary particle possesses both charge and mass? Such types of questions are not discussed in the frame work of general relativity.
The first step in unification is to understand the origin of the rest mass of a charged elementary particle. Second step is to understand the combined effects of its electromagnetic (or charged) and gravitational interactions. Third step is to understand its behavior with surroundings when it is created. Fourth step is to understand its behavior with cosmic space-time or other particles. Right from its birth to death, in all these steps the underlying fact is that whether it is a strongly interacting particle or weakly interacting particle, it is having some rest mass. To understand the first two steps somehow one can implement the gravitational constant in sub atomic physics.
To bring down the Planck mass scale to the observed elementary particles mass scale a large scale factor is required. Just like relative permeability and relative permittivity by any suitable reason in atomic space if one is able to increase the value of classical gravitational constant, it helps in four ways. Observed elementary particles mass can be generated and grand unification can be achieved. Third important application is characteristic building block of the cosmological dark matter can be quantified in terms of fundamental physical constants. Fourth important application is – no extra dimensions are required. Finally nuclear physics and quantum mechanics can be studied in the view of strong nuclear gravity where nuclear charge and atomic gravitational constant play a crucial role in the nuclear space-time curvature, quantum chromodynamics and quark confinement. Not only that cosmology and particle physics can be studied in a unified way. In this connection it is suggested that square root of ratio of atomic gravitational constant and classical gravitational constant is equal to the Avogadro number.  The Avogadro constant expresses the number of elementary entities per mole of substance and it has the value mol–1. Avogadro's constant is a scaling factor between macroscopic and microscopic (atomic scale) observations of nature. It is an observed fact. The very unfortunate thing is that even though it is a large number it is neither implemented in cosmology nor implemented in grand unification.
Here the very important question to be answered is – which is more fundamental either G or Gs ? It is proposed that both can be considered as the 'head' and 'tail' of matter coin. It can also be suggested that classical G is a consequence of the existence of atomic Gs. It is known that there is a difference in between 'absolute findings' and 'absolute measurements'. Absolute findings can be understood where as 'absolute measurements' can not be made by nuclear experiments which are being conducted under the sky of universal gravity with unknown origin of elementary particles mass.
Till today there is no explanation for this fantastic and large difference between G or Gs or between gravitation and strong interaction, about 10−39. It can be supposed that elementary particles construction is much more fundamental than the black hole's construction. If one wishes to unify electroweak, strong and gravitational interactions it is a must to implement the classical gravitational constant G in the sub atomic physics.  By any reason if one implements the Planck scale in elementary particle physics and nuclear physics automatically G comes into subatomic physics. Then a large arbitrary number has to be considered as a proportionality constant. After that its physical significance has to be analyzed. Alternatively its equivalent 'strong atomic gravitational constant' can also be assumed. Some attempts have been done in physics history.
Whether it may be real or an equivalent if it is existing as a 'single constant' its physical significance can be understood. Nuclear size can be fitted with 'nuclear Schwarzschild radius'. Nucleus can be considered as 'strong nuclear black hole'. This idea requires a basic nuclear fermion! Nuclear binding energy constants can be generated directly. Proton-neutron stability can be studied. Origin of strong coupling constant and Fermi's weak coupling constant can be understood. Charged lepton masses can be fitted. Such applications can be considered favorable for the proposed assumptions and further analysis can be carried out positively for understanding and developing this proposed 'Avogadro's strong nuclear gravity'.
Unification means: finding the similarities, finding the limiting physical constants, finding the key numbers, coupling the key physical constants, coupling the key physical concepts, coupling the key physical properties, minimizing the number of dimensions, minimizing the number of inputs and implementing the key physical constant or key number in different branches of physics. This is a very lengthy process. In all these cases observations, interpretations, experiments and imagination play a key role. The main difficulty is with interpretations and observations. As the interpretation changes physical concept changes, physical equation changes and finally the destiny changes.
Note that human beings are part of this universal gravity. There are some natural restrictions to experiments. Seeing a black hole is highly speculative. But indirectly its significances can be well understood. In the similar way in nuclear and particle physics: any experimental setup which is being run under the influence of the proposed strong nuclear gravity, without knowing the probing particle’s massive origin, without knowing the massive origin of the nucleus: based on ‘grand unified scheme’ one may not be able to unearth the absolute findings. Note that observer, experimental setup and the probing particle all are under the same influence of universal gravity. When searching for an experimental proof in grand/final unification scheme or dark matter projects this fact may be considered positively for further analysis.
To conclude it can be suggested that – existence of strong gravitational constant as Atomic gravitational constant is true and its consequences can be understood easily and can be implemented easily in grand unification program and dark matter projects.