Static and Dynamic Components of the Redshift

We analyse the possibility that the observed cosmological redshift may be cumulatively due to the expansion of the universe and the tired light phenomenon. Since the source of both the redshifts is the same, they both independently relate to the same proper distance of the light source. Using this approach we have developed a hybrid model combining the Einstein de Sitter model and the tired light model that yields a slightly better fit to Supernovae Ia redshift data using one parameter than the standard ΛCDM model with two parameters. We have shown that the ratio of tired light component to the Einstein de Sitter component of redshift has evolved from 2.5 in the past, corresponding to redshift 1000, to its present value of 1.5. The hybrid model yields Hubble constant ( ) 1 1 0 69.11 0.53 km s Mpc H − − = ± ⋅ ⋅ and the deceleration parameter 0 0.4 q = − . The component of Hubble constant responsible for expansion of the universe is 40% of 0 H and for the tired light is 60% of 0 H . Consequently, the critical density is only 16% of its currently accepted value; a lot less dark matter is needed to make up the critical density. In addition, the best data fit yields the cosmological constant density parameter 0 Λ Ω = . The tired light effect may thus be considered equivalent to the cosmological constant in the hybrid model.

and the deceleration parameter 0 0.4 q = − .The component of Hubble constant responsible for expansion of the universe is 40% of 0 H and for the tired light is 60% of 0 H . Consequently, the critical density is only 16% of its currently accepted value; a lot less dark matter is needed to make up the critical density.In addition, the best data fit yields the cosmological constant density parameter 0

Introduction
Until the discovery of cosmic microwave background radiation by Penzias and Wilson in 1964 [1], there was a debate about the cause of the redshift of light from extragalactic objects.Since then expansion of the universe by the Big-Bang theory became more and more favoured explanation of the cause of the redshift rather than the tired light and steady state theories.Ironically, it is the close analysis of the cosmic microwave background that has put into question the cause of the redshift due to the discrepancy in the Hubble constant derived from the spectral data and the microwave background data [2] [3].
The Hubble constant that relates the redshift to the distance of the source of light has shown steady decline in its value from about 500 km•s −1 •Mpc −1 to the currently accepted value of about 69 km•s −1 •Mpc −1 with improvements in measuring techniques and availability of redshift-distance data for high redshift sources.However, many cosmological models seek even lower value of the Hubble constant.Since the value of the Hubble constant determines plethora of cosmological parameters, including age, size and critical density of the universe, it is important to re-examine the potential causes of the redshift, or perhaps the composition of the redshift.
The status of the expanding universe and steady state theories has been recently reviewed by López-Corredoira [4] and Orlov and Raikov [5].They concluded that based on the currently available observational data it is not possible to unambiguously identify the preferred approach to cosmology.In a recent paper it was shown phenomenologically that Mach effect may be the cause of tired light redshift and may contribute dominantly to the cosmological redshift [6].While the paper's assumption that observed redshift may be the hybrid of the expansion of the universe and tired light effect may be sound, it incorrectly divided the distance modulus between the two components rather than keeping the proper distance the same and dividing the redshift.
Using Poisson's work on the motion of point particles in curved spacetime [7], Fischer [8] has shown analytically that gravitational back reaction may be responsible for the tired light phenomenon and could account for some or most of the observed redshift.His finding may also be related to Mach effect.Tired light, hereafter Mach effect, redshift approach defines the distance d of the light emitting source, whose redshift is z, by the equation: where 0 0 R c H = with c as the speed of light and 0 H as the Hubble constant.
The same distance in the standard ΛCDM model is defined as [9]: where ,0 m Ω is the matter energy density relative to the critical energy density, ,0 Λ Ω is the relative energy density corresponding to the Einstein cosmological constant, and Distance d is determined from the measurement of the bolometric flux f of the light emitting source and comparing it with the standard for that type of source with known luminosity L. The luminosity distance L d is defined as: (3) International Journal of Astronomy and Astrophysics while the flux could normally be related to the luminosity L with an inverse square law ( ) in a flat universe, it needs to be modified to include the effects of the redshift, the expansion of the universe, and any other unknown phenomenon, in order to determine the distance d of the source correctly.

Theory
If we assume the observed redshift to be due to two effects, we need to find out that in what proportion two effects contribute to the observed redshift.Let X z be the redshift due to expansion of the universe and M z be the redshift due to the Mach effect-we will use subscript X for expansion of the universe and M for Mach effect.The expansion will cause the emission wavelength e λ to stretch to wavelength X λ such that ( ) . This wavelength will be further increased due to the Mach effect before it is observed as wavelength  )( ) Considering now the scale factor ( ) a t relating the proper distance d to the comoving distance r between the galaxies, it can only depend on the component of the redshift that is due to the expansion of the universe rather than the whole redshift; i.e.

( ) (
) should be used as the scale factor.Let us estimate the loss of the flux of light in the measurement of the luminosity of an object due to: 1) Expansion of the universe: a) Stretching of the wavelength ( ) , and b) Increase in time between photon detection ( ) ( ) 2) Mach effect: It is only due to the increase in wavelength ( ) 3) Unknown factor: We found that there is an additional flux loss 1 1 z ∝ + .
The measured bolometric flux may thus be written as: The luminosity distance may now be written as: Since the proper distance d, often written as ( ) P d t , determined using either of the above models must be the same, equating them can give relationship between X z and M z , and also determine the deceleration parameter 0 q in the limit of 1 z  .We may rewrite Equation (1) for Mach effect as: ( ) Here X X R c H = with X H being the Hubble constant corresponding to the expansion model considered.We can use the limit 0 ⇒ as the boundary condition for Equation (7) and Equation (8); they both should reduce to the Hubble's law Expanding the two equations in the limit yields: ( ) This yields 0 . In the limit, we may write Equation ( 4) as ( ) + where w is the weight factor of Mach effect component and 1 w − is the weight factor for the expansion component.Comparing these equations with the text book expression for proper distance to a galaxy with redshift z [10] and deceleration parameter 0 q in the limit 0 z ⇒ : ( ) ( ) we get for the case of Mach effect ( ) And for the case of Einstein de Sitter model ( ) ( ) . Equating the two 0 q , we get 0.6 w = and 0 0.4 q = − .The same exercise can be done with Equation (2) with Thus, ( ) Let us now see how , X M z z and z are related for all values of z, rather than in the limit of 0 z  .Equating M d and X d -Equation (7) and Equation (8)-and using Equation (4) we get: ( ) where for brevity we have substituted 1 y z = + and 1 X x z = + .This can be numerically solved to determine x for any y, and thus X z for any z and also M z for any  since ( ) ( ) 6), Equation ( 8), and Equation ( 13), may now be combined to relate the luminosity distance L d with the observed redshift z.As the measured quantity is the distance modulus µ , not the luminosity distance L d , we will use the relation: We have used Equation (8) for proper distance in Equation ( 6).However, we could also use Equation (7) in Equation ( 6) without any change in the result since Equation ( 13) has already established equality of the two expressions determining the proper distance.
We could also use Equation ( 2) for the proper distance in the expanding universe model, equate it to the Mach effect proper distance: follow the same exercise as for Equation (13) to relate , X M z z and z, and then write the distance modulus relation:

Analysis Using Observational μ, z Database
The database used in this study is for 580 SNe Ia data points with redshifts 0.015 1.414 z ≤ ≤ as compiled in the Union2 μ, z database [11] updated to 2017.
We used Matlab curve fitting tool to fit the data using non-linear least square regression.To minimize the impact of large scatter of data points, we applied the "Robust Bi-square" method.This tool fits data by minimizing the summed square of the residuals, and reduces the weight of outliers using bisquare weights.The Goodness of Fit is given by parameters SSE (sum of squares due to errors), R-Square and RMSE (root mean square error).
Our objective is to see how well the composite model fits the observational data as compared to the standalone Mach effect model and the expansion models.The results are presented graphically in Figure 1, and numerically in Table 1; the table has one extra entry that is discussed below.
The first case is the standard ΛCDM model with two parameter fit, 0 H and m Ω .The values determined for the parameters are as expected.It provides a good two-parameter fit.This model has the legend "ΛCDM" in Figure 1.
In the second case, we have created a composite model by including Mach effect in the first case.The data fit is obtained using Equation ( 16).The Goodness of Fit numbers have slightly deteriorated compared to the first case.There is a slight decrease in the value of 0 H .However, the matter energy density has be- come almost 1, the same as for the Einstein de Sitter ("EdeS") model.One could therefore infer that Mach effect is equivalent to cosmological constant!
The third case is for the Einstein de Sitter model.The Goodness of Fit is not good.Also, the Hubble constant value is significantly lower than the previous cases.This model has the legend "EdeS" in Figure 1.
The fourth case is the composite model consisting of the Einstein de Sitter model and the Mach effect.Now the worst case has become the best overall fit case.Hubble constant is slightly lower than for ΛCDM models.This model has the legend "EdeS + Mach" in Figure 1.
The last case considered here is for Mach effect.It presents a not-so-good (OK) one-parameter fit.The Hubble constant value is the highest ( 0 70.52 H = ) of all the cases included here.This model has the legend "Mach" in Figure 1.
It may thus be concluded that the one-parameter ( 0 H ) Einstein de Sit- ter-Mach ("EDSM") composite model is slightly better than the two-parameter Figure 1.Fitted data curves for four models in Table 1.International Journal of Astronomy and Astrophysics Table 1.Parameters and "Goodness of Fit" for the analysed models, including those whose plots are shown in Figure 1.H Ω ) ΛCDM model for fitting the redshift data while yielding a 1% lower value of the Hubble constant.
We have shown the z (and hence the time) dependence of the new scale factor X a and other relevant parameter calculated in the EDSM model in Table 2 us- ing Equation ( 13).It does not involve any fitting of the data, just the model.The conventional scale factor is ( ) We see that while the two scale factors are the same at z = 0 and about the same at the lowest non-zero value in the table, X a decreases much more slowly than ( ) . This is expected as only a portion X z of z is due to the expansion of the universe, the remaining M z being due to the Mach effect.Figure 2 shows on a log-log grid how the new scale factor X a compares with the conventional scale factor ( ) , especially al lower values of z, say up to z = 10.This may be easier to use in some calculations than numerically solving Equation (13).
The ratio M X z z is also shown in the table.It increases from the present value of 1.5 to 2.5 for the redshift going from 0 to about 1000, meaning that Mach effect was contributing 71% to the redshift then compared to 60% now.
One question naturally arises: How is the cosmological constant of the ΛCDM model related to the Mach effect of the EDSM model?The question is best answered by analysing the Friedmann equation.The simplest Friedmann equation containing the cosmological constant Λ is for the spatially flat universe [10]: Here a is the cosmological scale factor, a  is the time derivative of the scale factor, G is the gravitational constant, and ε is the energy density.Equation ( 17) is based on the assumption that all the redshift relates to the velocity of the expansion of the universe: , and hence the scale factor that represents the expansion of the universe is really ( )  with no Λ.So, we may write the Friedmann equation for the spatially flat universe as: Table 2. Parameters based on the numerical solution of Equation (13).The conventional scale factor ( ) a t is normally taken as ( )

Conclusions
The extragalactic redshift results not only from the expansion of the universe but also from light losing energy in traveling vast distances from source to observer.
By combining the two, through the fact that both the contributions to the redshift measure the same proper distance of the source, we have come up with a one parameter model that fits the redshift SNe Ia data with the same Goodness of Fit as the standard ΛCDM model that requires an additional adjustable parameter.The new model, dubbed EDSM, yields: 1) The Hubble constant 2) The deceleration parameter 0 0.4 q = − .
3) The Λ equivalent for EDSM model 4) The variation of the expansion scale factor with  that is substantially less steeper than ( ) 5) The Hubble constant component that results from the expansion of the universe is 0 0.4H and that from Mach effect is 0 0.6H .6) A boost to baryon density parameter by a factor of 6.25, resulting in a greatly reduced dependence on dark matter to explain cosmology.

H
being the Hubble constant corresponding to International Journal of Astronomy and Astrophysics the Mach effect.Regarding Equation (2) for the expansion model, we will be exploring how the density parameters, taken usually as the inclusion of Mach effect.We will start with the Einstein de Sitter model.It can be expressed as: 0 u = may be written as: above analysis yields contribution to Hubble constant by the expansion of the universe tein de Sitter model for the expansion of the universe, and as the expansion model.The data analysis presented in the next section will determine the best parameters.

1 1 z
+ .The fit to the calculated values is reasonably well represented by

Figure 2 .
Figure 2. Variation of the new scale factor X a with the conventional scale factor ( ) 1 1 z + plotted on a log-log grid.Calculated values using Equation (13) are shown as blue dots.Also is shown a power fit curve in red.
since the expansion of the universe is determined by a fraction of the redshift.
X a z