Gravitation Theory Based on the Physics of an Absolute Reference System

The study of the effect of the gravitational field on the photons, based on the hypothesis of the absolute reference system, demonstrates the origin of the gravitational force. By studying the propagation of a photon in the gravitational field the change in the estimation of time is determined, resulting from the use of a clock that is affected by the gravitational field. It is proved that in all known experiments, which were carried out in order to confirm the general theory of relativity, the results based on the hypothesis of an absolute reference system agree with the corresponding results of the general theory of relativity, except for the result of the deflection of light in the gravitational field of the sun, where the experimental results confirm the hypothesis of the absolute reference system.


Introduction
The motivation for the study presented in this article is to examine the agreement of the hypothesis of the absolute reference system with the already obtained experimental results that have emerged from the relevant tests of the general theory of relativity. In order to carry out this examination, we first study the effect of the gravitational field on a photon, and then we study the corresponding effect of the gravitational field on material bodies, since, based on the hypothesis of the absolute reference system, the elementary particles of matter are composed of bound photons. This study contributes to the formulation of a gravitational theory that fully meets the requirements expressed by all the concerns Using the principles of the hypothesis of an absolute reference system, we first consider the origin of the attracting force of a gravitational field coming from a spherical homogeneous body of mass M. By this study emerge the characteristics of the effect of the gravitational field on the photons that propagate in the space around this body. A photon, which is affected by this gravitational field, behaves as a particle with mass Using all these theoretical results, which are taken by the formulation of the physics of an absolute reference system in [1] [2] [3], we study in the last section the experimental tests of the general theory of relativity in order to test experimentally the hypothesis of an absolute reference system.

The Origin of Attractive Force in a Gravitational Field
Considering that the elementary electromagnetic oscillation of a photon is the oscillation of the ether, as a means of propagating electromagnetic wave, it follows that the radial propagation of photons, which are force carriers of the gravitational field of a spherical body of mass M, makes the ether surrounding the Therefore, if a photon comes from a space away from the body of mass M, so that it can practically be thought to come from a space outside the gravitational field, and propagates in the gravitational field, then this photon will be affected by the pre-existing oscillation of the propagation medium, i.e. will be affected by the oscillation of the ether.
In the next two sections the clock which is used to measure speed, momentum, force and energy inside and outside the gravitational field is currently a clock which is outside the gravitational field. We also consider that outside the gravitational field is a body or a measuring instrument when it is very far from the body to which the gravitational field is due.
Based on the hypothesis of the absolute reference system, the elementary photonic wave is considered to be an oscillator whose average value of kinetic energy is equal to ( ) 1 2 hν , where h is Plank's constant and ν is the frequency, and is also equal to the mean value of the dynamic energy ( [2], Subsection 3.3. Harmonic Oscillator). The total energy of a photon will be equal to hν . Also according to the section "Introduction to Particle Mechanics" in [1], we have the where ph m is the photonic mass and c is the speed of light in vacuum. We must then consider the effect of the gravitational field on a photon coming from a space in which there is no gravitational field, and then propagates in a gravitational field, that is, on the already disturbed ether.
Based on the intrinsic properties of the ether, a portion of the oscillation of the aforementioned photon, equivalent to an amount of energy, ph E , is subtracted from the original photon energy it had when it was outside the gravitational field.
This amount of energy, ph E , is added locally to the gravitational field energy.
Under these conditions the photonic energy decreases in the gravitational field and therefore the photonic mass and the photonic speed will be functions of the radial distance as we will see below. Due to this change we will then denote by o ph m , o c and o ν the mass, velocity and frequency of the photon outside the gravitational field, while inside the gravitational field these quantities will be denoted by ph m , c and ν respectively for the same photon. Since the sum of the total photon energy, 2 ph m c , inside the gravitational field and the energy ph E gives the total photon energy that the photon had outside the gravitational field, the relation of the photonic energies outside and inside the gravitational field is: We will then examine the force exerted on the aforementioned photon in the gravitational field due to the existence of a spherical homogeneous celestial body.
The mass of the spherical body is denoted by M. The energy ph E depends on the local density of the oscillating force carriers of the gravitational field, which are photons as we mentioned before, so it depends on the radial distance r from the center of the spherical body. Therefore the quantities ph m , c and ν will be K. Patrinos Journal of Applied Mathematics and Physics functions of the radial distance r. The dependence of the energy ph E on the radial distance r is the cause of the existence of the gravitational force, which is exerted on the aforementioned photon. The work of this force along a vector differential displacement dr is This means that at a given radial distance there will be a gradient of the photonic energy, which causes a force dependent on this position. In polar coordinates r, θ , with unit vectors ˆr u , û θ , . Therefore the function of the force ( ) f r , which is the gradient of the photonic energy we talked about before, will be given by the relation: If at radial distance r the energy ph E is expressed as Also the relation (1) give us the differential equation this case from the spherical body, is inversely proportional to the square of the radial distance, and is also proportional to the force exerted by the gravitational field. Therefore the function ( ) f r , which expresses the gravitational force due to the gravitational field of a spherical homogeneous body, will be proportional to the quantity 2 1 r and will also be proportional to the masses M and ph m .
So, since the values of ( ) f r are negative, the force vector will obey the relation: (4) which is the well-known Newtonian gravitational force, and G is the known universal gravitational constant. According to the hypothesis of the absolute ref-

Mass and Velocity of a Photon in the Gravitational Field
The momentum of the photon, without the presence of a gravitational field, making use of the clock which is outside the gravitational field, is given by the where ph m , c are functions dependent on the radius r. We consider that the photon propagates in space with the simultaneous presence of a gravitational field derived from the spherical body of mass M. Therefore, for a vector differential displacement dr , given that According to the relations (4) and (7), given that ˆd d d r ru r u θ θ = + r , we get the relation: According to the relation (4) the function of the gravitational force exerted on the aforementioned photon is given by the relation Therefore, using the relation (3), we get the following equality: After the subtraction of Equations (8) and (9), the integration for radial distance from r to ∞ give us: which means that the velocity of the photon decreases as it enters the gravitational field. By doubling the two members of the relation (8) and subtracting them from the two members of the relation (9) we get the equality: is due to the dependency on the radial distance, will be analogous to the corresponding function of the mass of a body located inside the gravitational field. If m and m o are the masses of a spherical body inside and outside the gravitational field respectively, and r is the radial distance, the mass function m is given by the relation: The dependence of mass on radial distance changes the equation of motion of a body, or a photon, that moves under the influence of the gravitational field. As it turns out easily, the orbital angular momentum remains constant during the movement, since the gravitational force is central. The equation of motion, for a velocity v much less than the speed of light in vacuum, is given by the relation: In order to determine the differential equation of the trajectory and the corresponding solution, which is the radial distance as a function of the polar angle θ we will replace the operator d dt with its equivalent and Integrable Power-Law Potentials, Equation ) and in addition we will change the variable r with the variable u according to the relation 1 u r = .
Making these substitutions, the differential Equation (14) becomes: Equation (15)  For a photon propagating in the gravitational field, according to the hypothesis of the absolute reference system, the procedure for determining the orbital equation will be the same as the previous one. Therefore, it will obey the relation: K. Patrinos Journal of Applied Mathematics and Physics

Gravitational Time Dilation and Redshift
In the previous two sections, all values of velocity, momentum, force and energy, for phenomena occurring within the gravitational field, are obtained using a clock outside the gravitational field. What we will examine in this section is the estimation of time with a clock inside the gravitational field, and the effect that this redefinition of estimated time has on the estimation of all the aforementioned physical quantities.
For the time being, however, let us continue to estimate time using the clock that is outside the gravitational field. We have already calculated the changes in mass and velocity of a photon resulting from its entry into a gravitational field.
The corresponding change in frequency is determined by the relation 2 ph m c hν = .
From the relations (10) and (11) the following relation emerges: If we consider o ν the frequency of a photon outside the gravitational field, , the correlation between ν and o ν , which is the change in frequency when a photon enters a gravitational field, is given by the relation: There is yet another change that the elementary photonic wave undergoes, that is, the photon, and that is the change in wavelength. To determine this change we will use the equation c νλ = . According to Equations (10) and (18), we get : T n c λ = . Therefore: According to the hypothesis of the absolute reference system, the estimated is the corresponding estimated time using a clock outside the gravitational field, then the correlation of these times is given by the equation: The corresponding result of the general theory of relativity is: so, according to the relations (11) and (24), the estimated energy of the photon is Therefore, in a first order approach, the estimated energy of the photon becomes: Let us consider the example of a hydrogen atom located at a position r within the gravitational field. This atom is considered as a physical system, where the electron moves under the influence of the electric field of the nucleus. According to the hypothesis of an absolute reference system, the mass of an electron outside the gravitational field is given by the equation: However, this constant amount of energy can not affect the energy values that have come from transitions of the aforementioned atom in our example. This means that the differences between the energy stations of the hydrogen atom within the gravitational field will be equal to the corresponding differences of the same atom outside the gravitational field. But there is a difference. The photons that have resulted from these transitions inside the gravitational field will have a lower Journal of Applied Mathematics and Physics frequency than the corresponding ones outside the gravitational field, i.e. they will have shifted to red, due to the existence of the term o ph GMm r in the relation (27). Because the estimated photonic energy, g ph  , at the position r resulting from an energy transition is equal to the corresponding photon energy outside the gravitational field, this redshift is not perceived. However, this redshift is perceived when a photon, which has come from the aforementioned energy transition inside the gravitational field at position r , moves radially towards the exit from the gravitational field, since the estimated energy o g ph h GMm r ν + decreases as the radial distance r increases, and the estimated frequency g ν , already shifted to red, remains constant.
The calculation of the estimated energy as a function of wavelength, according to the relations (19) and (25), given that ing the gravitational field is given by the relation: while the relative change in the estimated energy, which gives us a quantitative estimate of the shift to red, is given by the equation: The corresponding estimate according to the general theory of relativity is given by the relation:

Using the Experimental Tests of the General Theory of Relativity to Experimentally Test the Hypothesis of an Absolute Reference System
In this section we examine the known experimental tests of the general theory of relativity, in order to determine whether the experimental results confirm the hypothesis of the absolute reference system.
In order to achieve this we use the theoretical study that has already been de-

K. Patrinos Journal of Applied Mathematics and Physics
veloped in the previous three sections.

The Advance of the Perihelion of Mercury
Denoting the mass of the Sun by M and the mass of Mercury by m, according to Equations (12) and (15), we get the equation: , the first order approach is given by the differential equation: We define the constants: The solution of the differential Equation (36) has the form: where K is constant. Because the orbit of Mercury around the Sun is elliptical it will obey the relation: where a is the length of the semi-major axis of the elliptical orbit and ε is the eccentricity. As is well known the eccentricity of the elliptical orbit is less than unit. Comparing Equations (37) and (38), if we consider: 2 Aθ = π . For 0 Aθ = the angle θ is zero, while for 2 Aθ = π the angle θ is given by the relation: This result is the same as that of the general theory of relativity ( [7], § 101. Motion in a centrally symmetric gravitational field) and is confirmed by observations already announced in the 19th century.
The contributions to the motion of the perihelia of Mercury and the earth are described in [8] (see [8],  (1947), with significant improvements in accuracy and including additional effects is in [9] (see [9], TABLE III).
A similar description, based on the concept of "ether disturbance" due to the gravitational field and giving similar results, has been announced by Antonis N.
Agathangelidis, in [10]. However, this description is different from this of the hypothesis of the absolute reference system.

The Deflection of Light in the Gravitational Field of the Sun
When a photon enters the gravitational field of the sun, its energy changes from the value where ε is the eccentricity, which is greater than unit, and a is the distance from the center C to the vertex V called the semi-major axis (Figure 1).
The solution of the differential Equation (16) is given by the equation: ′ ′ are the constants given by the equations:  Comparing Equations (42) and (43), we observe that by setting: The value of R ε is equal to the length OV of Figure 1. The corresponding value of R ε is given by Equation (43) Substituting the A′ , B′ and R ε , the value of K ′ is given by the equation: which is the factor that is multiplied by cos Φ in Equation (42). Therefore The maximum angle, max Φ , is obtained when r becomes infinite, so that the direction of OP becomes parallel to the dashed asymptotic line ( Figure   1). In this case Equation (42) gives: Therefore the deflection angle δ , according to Figure 1, is given by the equation: Since, as we will see below, the angle δ is very small, with the help of the relation (45) we can consider that: The corresponding angle δ ′ that can be derived from the angle θ according to the relation max , is given by the following relation: which means that the angle δ ′ , with a very good approximation, does not differ from the angle δ . We can determine the value of ε from Equation (44), having previously determined the value of the constant angular momentum. The angular momentum can be calculated at the position of the minimum distance, R ε , ie when the photon passes through the position V of Figure 1, so it is given by the relation: where V m and V c is the photon mass and velocity when the photon passes through the position of the minimum distance R ε . If we set p. 330), which were: From declinations 1".94; From right ascensions 2".06. The result from declinations is about twice the weight of that from right ascensions, so that the mean result is 1".98.
As stated in the article [11], "it was recognized that these would prove to be much the most trustworthy", in contrast to the measurement in Principe, for which the same article states that "The Principe observations were generally interfered with by cloud…". The experimental results are presented in Table 1. More details are mentioned in a relevant lecture, about gravitational lensing, in [12].
Bergmann's book ( [13], The deflection of light in a Schwarzschild field p. 221) states that "The predicted deflection amounts to no more than about 1.75" and is just outside the limits of experimental error. A quantitative agreement between the predicted and the observed effects cannot be regarded as significant". In summarizing the results of the two expeditions, the greatest weight must be attached to those obtained with the 4-inch lens at Sobral. From the superiority of the images and the larger scale of the photographs it was recognized that these would prove to be much the most trustworthy. Further, the agreement of the results derived independently from the right ascensions and declinations, and the accordance of the residuals of the individual stars ( [11], p. 308) provides a more satisfactory check on the results than was possible for the other instruments.

Principe observations
The deflection obtained was 1".61 probable error of about ±0".30 The Principe observations were generally interfered with by cloud. The unfavorable circumstances were perhaps partly compensated by the advantage of the extremely uniform temperature of the island.
The Sobral astrographic plates The deflection obtained was 0".93 discordant by an amount much beyond the limits of its accidental error For the reasons already described at length not much weight is attached to this determination.

The Time Delay of Light
We will now study the test proposed by Irwin I. Shapiro in order to measure a time delay (Shapiro delay) in the round-trip travel time for radar signals reflecting off other planets ( [14]), sometimes called the fourth "classical test" of general relativity.
We consider that an electromagnetic signal is emitted from Earth, reflected on a planet (or spacecraft) and returned to Earth, but under the influence of the Sun's gravitational field during its motion towards the planet and during its return to the Earth. We will calculate the time delay due to the effect of the solar gravitational field on an elementary photonic signal, i.e. a photon. The path of the examined photon is the path CBABC, of the axis x shown in Figure 2. Of course the deflection angle, which was calculated in the previous section, is very small, so the above-mentioned orbit is considered straight. Here we have ignored the motion of the Earth and planets during the round trip of the signal, because the corresponding velocities, estimated in the reference frame of the solar system, are much slower than the speed of light in vacuum.
During the path CB, i.e. after the signal leaves the Earth, when the photon is in a random position P (Figure 2), as distance x we consider the length of the segment BP, and r is the distance of point P from the center of the Sun. The length of d is the minimum possible distance of the photon from the center of the Sun during its round trip path. As the photon moves from the position C to the position B, that is, immediately after its departure from Earth, the distance x decreases, so the speed of the photon, c, which depends on the radial distance r, will be d d c x t = − . Therefore, according to the relation (10), the time differential is given by the relation: A first order approximation of time differential is given by the equation: the differential dx is given by the relation

The Gravitational Redshift
We will first study the redshift due to the Earth's gravitational field for example, which is observed if two measurements of the estimated energy of a photon are taken at two different radial distances r 1 and r 2 that differ only slightly, and This result is also predicted by the general theory of relativity. The same effect from the solar photosphere to 1 AU amounts to:

Conclusion
The physics of an absolute reference system is a comprehensive and self-contained view of physical reality, extending to all areas of the physical sciences, and confirmed by a wide range of scientific observations and experiments, including all experiments performed from time to time in order to confirm the special and general theory of relativity. It is found that some of these experiments do not confirm the theory of relativity, but nevertheless confirm the hypothesis of the absolute reference system. In this article, the calculations are confirmed by the experimental results, and it is also found that the prediction for the experiment on the deflection of light in the gravitational field of the Sun on the basis of the hypothesis of the absolute reference system, is in better agreement with the experimental data compared to the corresponding prediction of the general theory of relativity. It is therefore necessary to carry out an experiment in order to take high-precision measurements of light deflection, in the special case of the effect of the gravitational field of the Sun.

Conflicts of Interest
The author declares no conflicts of interest regarding the publication of this paper.