If the Redshift Depends on the Pressure then the Acceleration of the Universe Can Be Explained

We propose a model where the Hubble's law is slightly changed. We propose new interpretation of the covariant divergence of the energy-impulse vector and this produce a new correction to redshift. Acceleration of the expansion of the Universe appeared as a pure observational effect. High values of the mass density are consistent with the experimental data on Supernova Ia within this FRW model without the cosmological constant   0   .


Introduction
The equation of continuity with the classical linear equation of state   1 P     [1][2][3][4][5][6] where is the pressure, P  is the density of matter and 1 w    is the coefficient, leads to negative pressure values for .The CDM model predicts effective value for which is negative [7,8].Then for a small scale factor in the beginning of the Universe the total amount of matter in the Universe would be negligible.When the scale factor increased the matter appeared literally from nothing.
We propose new correction to redshift which can be useful in cosmology.This explains the appeared acceleration of the Universe.High values of the mass density are consistent with the experimental data on Supernova Ia within this model without the cosmological constant .We compared this model with the experimental data of the Supernova Cosmology Project Supernova Ia compilation.We assumed that 0 and and curvature is positive).We assumed also that , where is the parameter of this model and is the redshift.We found the optimal values 1     0 .The quality of this regression was as high as it was in the  CDM model.Yet the value of was much less in the absolute value than in the CDM model.The acceleration of the Universe appeared to be a pure observational effect due to the negative pressure.w 

The Equation of Continuity
The Einstein equations with the cosmological constant where 26 2 8 1.8659218 10 m kg   To solve these equations we should know the energymomentum tensor T  .For synchronous coordinates the energy-momentum tensor is Diag , , , where  is the density of matter and is the pressure of matter.The covariant divergence of the energymomentum tensor is zero: Considering ( 22) we obtain for the 0 s T component.Assume that the pressure is proportional to the density: for the dust matter this value is 1   and the value for radiation is 4 3 Considering physical dimensions of values, the Equation ( 3) is better as Hence Let us compare this equation with the change of volume of the Universe for closed models.The Friedmann-Robertson-Walker metric in the cosmic time and in the polar coordinates is where and is the curvature parameter .The 3-volume element at is The volume of the Universe at Since our Universe is homogeneous, the total amount of matter in the Universe at some where 1 w   

V
. Hence for and a sufficiently small the total amount of matter in the Universe will be negligible: when and 0 a  0 w  .Cosmology with 0 w  violates the law of conservation of matter (conservation of leptonic and baryonic numbers [10]).The idea that matter originated from radiation is not a good idea because is too large.The matterantimatter asymmetry also cannot be explained in this way.Cosmology with negative pressure contained a "smooth bounce" from the collapsing to expanding stage and this was also due to the same fact.Since the matter disappeared, the gravitation force was negligible and we obtained the smooth bounce with the horizontal tangent [11][12][13].The only equation which is fully consistent with (5) and conservation of leptonic and baryonic numbers is This is due to the equation const V   .The Equation (3) could work for the appropriate epoch only.
Let us try to interpret the covariant divergence of the   0 , p j 4-vector.If currents are negligible (as in the comoving frame), then will get an additional nonzero component and will increase or decrease additionally.It seems reasonable because is the energy and its change is the redshift.Hence this equation should give a contribution to the redshift (and not bound the matter components).Since where is the pressure.Assume that Here is the energy density per unit volume.Integrating Since the Hubble law is and both contributions seem to be multiplicative, we get Hence the redshift depends on the matter equation of state.This correction to redshift e o 1 z E E   may be useful in cosmology.

The Hubble Diagram
Recall the distance formula.Define  -coordinate by The Friedmann-Robertson-Walker metric in the cosmic time becomes


The space part of the metric is Now we use our main hypothesis: The value of is the function of , therefore w z Finally where Suppose a source has an absolute luminosity , its luminosity (bolorimetric) distance is defined in terms of the measured flux The measured flux is one factor of   1 z  arising from the decrease in total energy due to the red shift of the energy of the individual photons, and the other factor of arising from the increased time interval between the detection of incoming photons due to the fact that two photons separated by a time We compared this model with the experimental data of the Supernova Cosmology Project Supernova Ia compilation 1 .In general no more than two parameters can be determined from these statistical problems [15].We assumed that and (yet and curvature is positive).We assumed also 0 where is the parameter of this model.We found the optimal values The optimal values for this simplified case for z  are

Comparing with the Riess Expansion
In the flat Universe   therefore the retardation parameter If the parameter introduced in this paper we obtain acceleration.Hence the acceleration of the Universe appears as a pure observational effect due to the negative pressure.

Fate of the Universe
Note that we have chosen 0 and 1.01 m   0   while interpreting the Supernova Ia experimental data.We had to make some assumptions on these parameters because large number of unknown parameters cannot be obtained from this simple regression.Yet since experi-mental data are consistent with 0 and 1.01 m   0   , then one can say that there is a solution of the Friedman equation wich accelerates for a short time in the beginning but there is a limit for the scale factor a .We can smoothly glue another solution where the Universe shrinks.
The question of the fate of matter at the end of the Universe is the most complicated.We assume that the matter does not disappeared at the end of the Universe.The matter with some unknown critical density should reproduce the hydrogen and provide condition for another Big Bung.The remnants of the Big Bung are black holes.We assume that all their singularities are topologically equivalent and lead to the same space-time moment in the past where the collapsing stage of the previous Universe ends and the new Big Bung begins.

The Section Curvatures
For completeness let us review the Christoffel symbols for the Friedmann-Robertson-Walker metric (4) and the section curvatures.The Christoffel symbols for the timelike dimension (i,j = 1,2,3) are 0 0 00 0 0 0, , and , 00 .The Christoffel symbols for the spacelike dimensions are these are all the nonzero components.Let be linear independent vectors of the tangent space for the manifold at the point , In local coordinates the section curvature in the direction

R g g g
(no summation for ).The section curvature of the FRW space in the directions 0 -1, 0 -2, 0 -3 is , i j a a  .
In general for any vectors such as , u v . The section curvature of the FRW space in the directions 1 -2, 1 -3, 2 -3 is   It seems sensible that without matter the spacetime should be flat.The section curvatures for the directions 0 -1, 0 -2, 0 -3 are In the absence of matter at present for it will be zero also.

Conclusion
We propose new correction to the Hubble's law which can be useful in cosmology.This correction and our assumption   w z vz  produce a model which is capable to explain the acceleration of our Universe.This model is also consistent with the parameters 0m 1.01    and 0   corresponding to nearly flat and topologically closed Universe.The value 0m   means that the expansion of the Universe will change to shrinkage yet we should observe acceleration at present.The assimmetry between matter and antimatter is also explained within this model.The matter does not appear from nothing at the beginning of the Universe; it is the same matter that worked at the previous cycle.The matter does not dissappear at the end of the Universe; it will just reproduce the hydrogen.The antimatter is not holes in the Dirac sea of states with negative energy; it is the matter with opposite set of quantum numbers.During the final state of the cycle (which is equally the first state of the new cycle) all properties of matter are equalized.

Figure 1 .
with these parameters is presented on the The quality of this regression is as high as it is in the ΛCDM model.High values of the mass density are consistent with the experimental data on Supernova Ia within this model.Yet the value of is much less in the absolute value than in the ΛCDM model.wTheTaylor expansion of the luminosity distance (18) is

.
23) where is the Riemannian curvature map [17, p.~94].Compared with the Riemannian case we have changed sign in this formula because the signature of our space is Lorentzian.With local coordinates R Angle brackets mean scalar product.The denominator is the square of the area of the parallelogram based on the vectors and .If we choose another basis in the same two-dimensional plane u v  defined by and v , then the section curvature does not change.Hence the value u v u K  depends on the plane  only.Therefore the value u v K  is assigned K  and is called the section curvature of the (pseudo)Riemannian manifold at the point N x in the two-dimensional direction  .
of the spacetime at present are zero.Indeed for the directions 1 -2, 1 -3, 2 -3 the section curvatures