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Based on the gravitational theory, fundamental data, and comprehensible suppositions, an evolution model of the universe was proposed. The universe exists in explosion and constringency mobile equilibrium state. The critical sizes of celestial bodies were calculated in their evolution process.

As the theoretical ratiocination (Einstein’s theory of relativity) and the cumulating of the more and more obtained data or phenomena from astronomic observation of the celestial bodies, people began to have a general impression of the universe, such as the clangorous words expressed: big bang, expanding universe, and black hole et al. (Ginsburg 1985). From a point of view that the microcosm decides the macrocosm, more information of the universe can be predicted from present knowledge of the elementary particles.

In this paper, some parameters of evolution of the universe were calculated. The main thoughts were the Newton’s universal gravitation and the structures of matter.

The gravitational constant, G, is 6.670 × 10^{–11} N m^{2}·kg^{−2}. The radius of hydrogen atom, a_{0}, is 5.29 × 10^{−11} m. The mass density of atomic nucleus, ρ_{n}, was determined (Erdei 1976) to be 2 ×10^{17} kg·m^{−3}. The mass of neutron, m_{n}, is 1.67495 × 10^{−27} kg, radius r_{n}, 1.2598 × 10^{−15} m. The combining energy of nucleus is 8 MeV. The gravitational acceleration on earth surface is 9.81 m·s−2. The sun has the mass of 1.989 × 10^{30} kg, density of 1.409 × 10^{3} kg·m^{−3}, radius of 6.960 × 10^{8} m.

Suppositions: the combining energy of nucleus (strong interaction in nucleus) came from gravitation, and the nucleus consisted of gravitons; the combinative form between nucleus was its overlaps one another.

According to Newton’s law, the gravitational force between two distant particles has the form:

, and. Hence, the gravitational acceleration,.

However, to a neighboring large body (has a mass of M, radius of R), the radius of the body cannot be neglected; its accurate result can be obtained by processing a mathematical integral.

As

where, “M” is the arbitrary point in the solid sphere, “h” the point corresponding to “M” horizontally. “r” is the distance of the point “M” from original point “o”, ρ′ is ideally homogeneous mass density of a solid sphere, ρ the average one. k stands for the calibration factor of average mass density.

For a general integral

For integral

For general integral

Let f =

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Substituted (3) with (4)

As the results of (2) and (5) expressed, thus, (1) becomes

Let, then,

F(n) is a function of n. The, F – n, diagram was showed in

For the earth, the average mass density ρ is 5.5153 × 10^{3} kg·m^{−3}, the radius R is 6.356078 × 10^{6} m. The gravitational acceleration on earth surface was calculated (n = 1) to be 12.68 m·s^{−2}. However, the real value of gravitational acceleration on earth is 9.81 m·s^{−2}. It is 0.7736 times than the calculated one. It is because of the earth that does not have an ideally homogeneous density used in above formula derivation process. The ratio can be used as calibration factor, k, of average density of a solid sphere (ρ′ = kρ. For earth, k = 0.7736; and it was supposed to be fit for any other celestial bodies).

The gravitational pressure in center from solid sphere can be calculated according to Equation (6).

, (where,)

The integral, , can be calculated diagrammatically. The diagram showed in

The area beneath the curve calculated by computer gave the result of 0.62129. Thus, p = 0.62129 × 4Gkρ^{2}R^{2}/3. Supposing the considered celestial body has the same value of calibration factor k of earth, then we obtained

p = 0.6408Gρ^{2}R^{2}.(7.1)

The gravitational potential energy, E_{g}, from a solid sphere can be calculated.

According to relation (6), the integral, , can be calculated diagrammatically. The diagram showed in

The area beneath the curve calculated by computer

gave the result of 1.7193. Therefore, we have

E_{g} = 1.7193 × 4GkρmR^{2} = 5.320GρmR^{2}.(8.1)

Atoms have similar energy demand when one electron is compressed in nucleus forming a new atom (which has lower atomic number). Taking atom zinc as an example, when one electron of Zn is compressed in nucleus, the isotopic atom Cu is then formed. The energy demand, ΔE_{a}, can be calculated. According to quantum theory, the energy of an outer electron of a atom has the form E ≈ −13.6Z^{2}/n^{2} (in ground state). Thus,

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For an extreme hot electron of atom of hydrogenΔE_{a }= ΔE_{1 }+ 13.6 = 63.6 eV = 1.02 × 10^{−17} J As the gravitational force increasing, many radioactive isotopes formed with the atomic number decreasing. Considering the atom of hydrogen, that has the maximum compression radius a_{0}, we guessed that the hydrogen atoms would be the last element to be compressed to nucleus. Then, the maximum pressure, p_{max,a}, for compressing a hydrogen atom to neutron could be derived as:

ΔE_{a} = FΔr = pSΔr = pSa_{0.}

where, Δr was replaced with the radius of hydrogen atom a_{0.}

The pressure comes from the gravitation of celestial body. Combining Equations (7.1) and (9), we have 0.6408Gρ^{2}R^{2} = 1.64 × 10^{13}then,

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If a solid celestial body has the same average mass density of earth (5.5153), then

To a hot gas celestial body, which has the same average mass density of sun (1.409), then, we have

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A model of neutron star was showed in

The gravitational pressure on the surface of neutron body can be calculated. It contains two parts.

Equation (6) can express linearly in a short segment.

F(n) = 1.355571n, (n = 0 → 1).

According to Equation (7),

where, ρ_{n} is the nuclear mass density, ρ the mass density layer matter. Substituting the parameters, we have

Combining Equations (9) and (10), we have

According to Equations (6) and (11), we obtained following results:

R = 11.2 m, nR = 1121 m R = 16 m, nR = 32 m R = 261 m, nR = 261.6 m R = 15257 m, nR = 15257 m.

Combining Equations (7.1) and (13), we have

When the radius of a neutron star achieved its maximal value, as the mass continuing accumulating, a graviton body began growing, the radius of neutron star then decreased correspondingly. When the mass of graviton body grew large enough, the neutron star began to have the ability to draw back a photon; we call it becoming a body of black hole. The maximum radius of black hole can be calculated by imitating the process of what done in paragraph 3.2. Just replacing ρ and ρ_{n} with the value of ρ_{n} and ρ_{g} (showed in Equation (20)), Equation (11) became Equation (12). Where ρ_{g} is stands for the mass density of graviton.

According to Equations (12) and (13), following relations were obtained:

R = 0.971 m, nR = 9714 m, M = 7.679 ×10^{29} kg

R = 9.714 m, nR = 9714 m, M = 7.679 ×10^{29} kg

R = 97.10 m, nR = 9710 m, M = 7.671 ×10^{29} kg

R = 1154 m, nR = 9279 m, M = 6.722 ×10^{29} kg

R = 4078 m, nR = 7340 m, M = 4.537 ×10^{29} kg

R = 10793 m, nR = 11873 m, M = 3.672 ×10^{30} kg

R = 14090 m, nR = 14908 m, M = 7.825 ×10^{30} kg

R = 42004 m, nR = 42273 m, M = 1.971 ×10^{32} kg

R = 74934 m, nR = 75084 m, M = 1.114×10^{33} kg.

Nuclear has the combining energy of about 8 MeV (Wichmann 1971). Deducting the influence of proton, the maximum combining energy of nuclear would be 9.15 MeV, i.e., 1.47 × 10^{−12} J. The parameter of the radius of a graviton, r_{0}, is the first needs to obtain. Depending on above suppositions described in Section 2.1, and the normal gravitational potential energy formula, E = Gm_{1}m_{2}/r, substituting m_{1}, m_{2} with the mass of neutron, E with the combining energy in nucleus, then we have,

Supposing the energy demand for destroy a neutron, ΔE_{n}, is equal to its maximum combining energy, then we have

ΔE_{n} = 1.47 ×10^{−12} J.

Following the derivate process in Section 3.1, but replaced ΔE_{a }with ΔE_{n}, a_{0 }with r_{n},_{ }Equation (9) becomes

Following the derivate process in Section 3.2, but replaced ρ_{ }and_{ }ρ_{n} with ρ_{n}, and ρ_{g}, p_{max, a} with p_{max, n}, Equation (11) became Equation (14).

A Smallest Known Black Hole (named XTE J1650- 500) has the mass, M_{b}, of 7.558 × 10^{30} kg (Robert & Rob 2008). Perhaps it is not the minimal black hole theoretically; however, it was considered to be true here temporarily. According to the data and Equation (8), we have

Combining Equations (15), (16) and (17), we have Equations (18) and (19).

Combining Equations (18) and (19) diagrammatically, we obtained n = 1.0190.

R = 14090 m.

nR = 14358 m.

ρ_{g} = 6.3096 × 10^{17} kg·m^{−3}.(20)

where m_{g} is stands for the mass of a graviton.

The evolutive process of the universe was divided by us into six parts; and the process goes a circle (a → f →a).

a) Growing of normal celestial body. Preponderant normal celestial bodies will attract substances from its surroundings. It gradually grows as it accumulates the mass. It would have the maximum mass of 5.06 × 10^{29} kg, radius, 4.41 × 10^{8} km.

b) Formation of neutron star. As the continuously accumulating of matter, the normal molecular celestial body begins to compress accompanied with neutron body engendered in the center. The compressing process looks like a process of phase variation. In the process, it will release large quantity of energy (lose of masses), become an extremely hot body and shine. A maximum neutron star has a maximum mass of 2.98 ×10^{30} kg, maximum radius of 15.3 km.

c) Growing of graviton star. With continuously compressing, a graviton body would begin to grow in the center. The graviton star has a critical mass of 7.558 × 10^{30} kg, radius of 14.9 km.

d) Formation of black hole. When graviton star grows to its critical value, it becomes a minimum black hole in the mean time. It can capture photons just near its surface. Afterward, it gradually grows in mass with the accumulating of matter. As the mass increasing, far more distant photons can be hold in. The compressing energy that released absorbed by itself. As an isolated system, the entropy of the black hole decreased spontaneously in its growing process.

e) Explosion of black hole. When the density of black hole increased large enough, the distance between gravitons going over a critical small value, the gravitational mechanism destroyed. The gravitation becomes repulsive force. Then, explosion occurred; the entropy increased sharply. Neutrons, protons, electrons, etc. particles and afterward atoms were produced subsequently in the explosion process. After explosion, this part of universe exists in expansion state in a unabiding period.

f) Constringency of partial universe. In the late period of explosion, the running matters slowed down, spread in wide space, mixed, and became part of cosmic dusts. Then, partial universe would exist in a contractive state in a long run. In intermediate constringency, the celestial bodies formed.

When a celestial body has abundant material source in its surroundings, it will grow quickly and has a larger mass than we calculated. If the celestial body exists in process b, it would be a fixed star. The larger mass it has, the more quickly it will be compressed, and more efficiency the energy would release. i.e., the larger mass it owns, the higher brightness it will has. In this way, a shining star could burn with no existence of special fuels of nuclear fusion, but merely existence of normal atoms.

According to the calculated results in this paper, it is evident that every galaxy will have a big black hole in its center.

The universe consists of vast cosmic dusts and galaxies. They go along circle evolutive processes described above. Occasionally a limit big black hole explodes, causing the expansion in a partial space. However, in a long time scale, most space contracted slowly. The universe exists in a mobile equilibrium state of explosion and constringency (Thomas & Hermann 1948). Those observed stars, which leave away at acceleratory velocity (Hubble 1929), might result in other reasons. It is by no means that the whole universe is expanding now. Reversely, our surrounding universe showed us its contractive views. We cannot imagine that the shape of our Milky Galaxy is formed in an expansion process.

A roughly information about graviton was derived in this paper. It is an exiting result to the researchers in fundamental physics. Future observation of existence of new smaller black hole is apparently meaningful.