Abstract
In the present paper, we investigate some exact cosmological models in \(F(R,{\bar{T}})\) gravity theory. We have considered the arbitrary function \(F(R, {\bar{T}})=R+\lambda {\bar{T}}\) where \(\lambda \) is an arbitrary constant, \(R, {\bar{T}}\) are respectively, the Ricci-scalar curvature and the torsion. We have solved the field equations in a flat FLRW spacetime manifold for Hubble parameter and using the MCMC analysis, we have estimated the best fit values of model parameters with \(1-\sigma , 2-\sigma , 3-\sigma \) regions, for two observational datasets like H(z) and Pantheon SNe Ia datasets. Using these best fit values of model parameters, we have done the result analysis and discussion of the model. We have found a transit phase decelerating-accelerating universe model with transition redshifts \(z_{t}=0.4438_{-0.0790}^{+0.1008}, 0.3651_{-0.0904}^{+0.1644}\). The effective dark energy equation of state varies as \(-1\le \omega _{de}\le -0.5176\) and the present age of the universe is found as \(t_{0}=13.8486_{-0.0640}^{+0.1005}, 12.0135_{-0.2743}^{+0.6206}\) Gyrs, respectively for two datasets.
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1 Introduction
The universe underwent two episodes of accelerated expansion at early and late times of the cosmological evolution, according to the conventional paradigm of cosmology, which is based on a growing amount of observable data. Although the cosmological constant might be the best explanation for the late-time acceleration, the possibility that the acceleration is dynamic in nature and the presence of some potential tensions may call for a revision of our understanding-something that is unquestionably necessary for early time acceleration. There are primarily two paths one could take in order to accomplish this. The first is to build extended gravitational theories that, although having general relativity as a specific limit, can generally offer more degrees of freedom to adequately describe the evolution of the universe [1, 2]. The second approach is to modify the conventional particle physics model and take general relativity into account. This involves assuming that the universe contains additional matter in the form of dark energy [3, 4] and/or inflation fields [5]. Keep in mind that the first approach has the extra theoretical benefit of may be leading to an improved [6, 7].
One can begin building gravitational modifications from the Einstein-Hilbert action, that is, from the curvature description of gravity, and extend it appropriately, as in the cases of Lovelock gravity [8, 9], F(R) gravity [10], and F(G) gravity [11, 12]. He may also examine torsional modified gravities, such as F(T) gravity [13,14,15], \(F(T, T_{G})\) gravity [16], etc., starting with the analogous, teleparallel formulation of gravity in terms of torsion [17, 18]. Cosmologists are interested in f(T) teleparallel gravity, one of the intriguing modified theories of gravity. The study of modified Teleparallel f(T) gravity, where T is the torsion scalar, was driven by the generalization of f(R) gravity, where R is the Ricci scalar. To characterize the effects of gravitation in terms of torsion rather than curvature, [19,20,21,22] employed the curvatureless Weitzenböck connection in teleparallel gravity, as opposed to the traditional torsionless Levi–Civita connection in general relativity.
The linear forms of f(T) lead to a teleparallel gravity equivalent to general relativity (TEGR) [23]. Nonetheless, there are disparities in the physical interpretations of the two theories of gravity, f(T) and f(R). In f(T) gravity, the torsion scalar T just comprises the first-order derivatives of the vierbeins, but in f(R) gravity, the second-order derivatives of the metric tensor are contained in the Ricci scalar R. This means that, as opposed to other modified theories of gravity, the exact solutions of cosmological models in f(T) gravity may be readily found. f(T) gravity is a straightforward modified theory of gravity, however there aren’t many precise solutions suggested in the literature. In isotropic and anisotropic spacetime, some cosmological models [24,25,26] with power-law solutions have been discovered in the literature. Some cosmologists have studied some exact solutions of the cosmological models in [19, 27, 28] for static spherically symmetric spacetime and Bianchi type-I spacetime. When compared to other modified theories of gravity, the analysis of cosmic situations in f(T) gravity is straightforward. Consequently, a large number of cosmological scenarios, including the big bounce [29,30,31,32], inflationary model [33], and late time cosmic acceleration [34,35,36], are studied using f(T) gravity theory. In the field of f(T) gravity, there have been recent developments including spherical and cylindrical solutions [37], conformally symmetric traversable wormholes [38], and noether charge and black hole entropy [39]. Recently, we have discussed and reconstructed some \(\Lambda \)CDM cosmological models in f(T) gravity [40,41,42,43].
Additionally, nonmetricity could be used to create gravitational alterations [44]. Furthermore, altering the fundamental geometry itself might give rise to an intriguing class of modified gravity; this could include, for example, Finsler or Finsler-like geometries [45,46,47,48]. The non-linear connection’s potential to introduce additional degrees of freedom and make the gravitational modification phenomenologically interesting is one of the framework’s intriguing features [49, 50]. This feature was also obtained through the use of a different theoretical framework for metric-affine theories [51,52,53,54,55].
In [56], R. Myrzakulov found an intriguing gravitational modification called the \(F(R, {\bar{T}} )\) gravity. Both curvature and torsion are dynamical fields associated with gravity in this theory because one makes use of a particular but non-special connection. Because of this, the theory has additional degrees of freedom originating from both the non-special connection and the arbitrary function in the Lagrangian. The theory belongs to the class of Riemann–Cartan theories, which are part of the broader category of metric theories with affine connections [57, 58]. A few of the theory’s applications were examined in [56, 59,60,61,62]. Specifically, [56] addressed certain theoretical concerns; [59] examined energy conditions; [60] examined theoretical relationships with various scenarios; [61] examined Noether symmetries; and [62] examined neutron star theory. Recently, in [63] have analyzed the resultant cosmology of such a framework and to compute the evolution of observable quantities like the effective dark energy equation-of-state parameter and density parameters. By expressing the theory as a deformation from both general relativity and its teleparallel counterpart, they have examined the cosmological behavior with an emphasis on the connection’s effect by employing the mini-super-space approach. The observational constraints on \(F(R,{\bar{T}})\)-gravity have been investigated in [64]. Various Metric-Affine Gravity Theories and its applications are discussed in [65,66,67,68,69,70,71].
Motivated by the above discussions, in this paper, we investigate a spatially flat, isotropic and homogeneous spacetime universe in \(F(R, {\bar{T}})\) Gravity in the context of generalized connection \(\Gamma \), in which curvature R and torsion T both are non-zero. The paper is organized as follows. In Sect. 2, we give a brief review of the \(F(R,{\bar{T}})\) gravity theory. The cosmological solution for the particular linear case \(F(R,{\bar{T}})=R+\lambda {\bar{T}}\) are given in Sect. 3. Observational constraints for the model are studied in Sect. 4. The result analysis and discussions are presented in Sect. 5. The age of the universe is considered in Sect. 5.2. The last Sect. 6 is devoted to conclusions.
2 \(F(R,{\bar{T}})\) gravity and field equations
To explore the cosmological properties of the universe in \(F(R,{\bar{T}})\) gravity, we consider the flat Friedmann-Lemaître-Robertson-Walker (FLRW) space-time described by the metric
where \(a = a(t)\) is the scale factor. The orthonormal tetrad components \(e_{i}(x^{\mu })\) are related to the metric through
where the Latin indices i, j run over 0...3 for the tangent space of the manifold, while the Greek letters \(\mu \), \(\nu \) are the coordinate indices on the manifold, also running over 0...3.
We consider the action for \(F(R,{\bar{T}})\) gravity [56, 63] as
where \(e=\sqrt{-g}\) with g as the determinant of metric tensor \(g_{\mu \nu }\), \(R=R^{(LC)}+u\) and \({\bar{T}}={\bar{T}}^{(W)}+v\) with \(R^{(LC)}\) is the Ricci scalar corresponding to Levi–Civita connection and \({\bar{T}}^{(W)}\) is the torsion scalar corresponding to Weitzenbök connection. And u is a scalar quantity depending on the tetrad, its first and second derivatives, and the connection and its first derivative, and v is is a scalar quantity depending on the tetrad, its first derivative and the connection. Hence, u and v quantify the information on the specific imposed connection [63].
The general modified field equations for \(F(R, {\bar{T}})\) gravity are obtained by varying the action (3) with respect to metric field as below (see the reference [65] for detail):
where \(F_{R}=\frac{\partial F}{\partial R}, F_{{\bar{T}}}=\frac{\partial F}{\partial {\bar{T}}}\), \(R_{(\mu \nu )}\) is the symmetric part of the Ricci tensor of the affine connection \(\Gamma \), \({S_{\mu \nu }}^{\lambda }\) is the torsion tensor, \(S_{\mu }\) is the torsion trace, \(T_{ij}\) is the stress-energy momentum tensor defined by
On the other hand, the connection field equations are
where \({P_{\lambda }}^{\mu \nu }(F_{R})\) is the modified Palatini tensor,
with \(\nabla \) as the covariant derivative associated with the general affine connection \(\Gamma \).
Here, we consider the energy momentum tensor for perfect fluid matter source as
where \(\rho \), p are respectively, energy density and pressure of the considered perfect fluid matter source, \(U^{\mu }=(-1, 0, 0, 0)\) is the four velocity vector.
In this paper, we restrict ourselves to the case \(u=u(a,\dot{a})\) and \(v=v(a,\dot{a})\). The scale factor a(t), the curvature scalar R and the torsion scalar \({\bar{T}}\) are taken as independent dynamical variables. Then after some algebra the action (3) becomes [72],
where the point-like Lagrangian is given by
The corresponding field equations of \(F(R,{\bar{T}})\) gravity are obtained in [72, 73], as
where
3 Cosmological solutions for \(F(R,{\bar{T}})=R+\lambda {\bar{T}}\)
In this investigation, we take the arbitrary function \(F(R,{\bar{T}})\) in linear form in R and \({\bar{T}}\) as given by
where \(\lambda \) is an arbitrary constant, \(R=u+6(\dot{H}+2\,H^{2})\) and \({\bar{T}}=v-6H^{2}\). Using Eq. (14) in Eqs. (11) and (12), we obtain the field equations in the form
and
The energy conservation equation is obtained as
Now, we consider the scalars u and v in the form of [70]
where \(c_{1}\) is an arbitrary constant and s(a) is an arbitrary function of scale factor a.
Using Eq. (18) in Eqs. (15)–(17), we get the following form of the field equations (15)–(17):
and
For \(\lambda =0, c_{1}=0\), the field equations, (19) and (20) will reduced into original Einstein’s field equations in general relativity (GR). One can obtain the Friedmann like equations as
where \(\rho _{MG}, p_{MG}\) are the geometrical corrections in energy density and pressure, respectively given by
These, geometrical corrections, respectively, in energy density and pressure \(\rho _{MG}, p_{MG}\), called as effective dark energy sector in \(F(R,\bar{T})\) gravity. We can show that effective dark energy sector is conserved, namely \(\dot{\rho }_{MG}+3H(\rho _{MG}+p_{MG})=0\), and it can be easily deduced from matter energy conservation equation \(\dot{\rho }+3H(\rho +p)=0\).
We define the matter equation of state as \(p=\omega \rho \) with \(\omega =\)constant and using Eqs. (19) and (20), we get
or
After integration Eq. (26), we get
where \(c_{2}\) is an integrating constant.
Solving Eq. (27) for Hubble parameter H, we obtain
For \(c_{1}=0\), we get Hubble parameter as \(H(a)=\frac{\sqrt{6c_{2}}}{6\sqrt{1+\lambda }}\left( \frac{a_{0}}{a}\right) ^{3(1+\omega )/2}\) which gives a power-law expansion cosmology with a constant deceleration parameter (DP). If we take \(c_{2}=0\), then we find \(H=\) constant which gives exponential-law expansion cosmology with constant DP.
Using the relation \(\frac{a_{0}}{a}=1+z\) [3], we get
The deceleration parameter is derived from \(q=-1+(1+z)\frac{H'}{H}\) as
4 Observational constraints
For our model and dataset combination, we use the freely available emcee program, available at [74], to conduct an MCMC (Monte Carlo Markov Chain) analysis so that we may compare the model with observational datasets. Through parameter value variation across a variety of cautious priors and analysis of the parameter space posteriors, the MCMC sampler constrains the model and cosmological parameters. We then obtain the one-dimensional and two-dimensional distributions for each parameter: the one-dimensional distribution represents the posterior distribution of the parameter, whilst the two-dimensional distribution shows the covariance between two different values.
4.1 Hubble function
To ensure the model’s validity and feasibility, a model that aligns with observational datasets must be obtained. As a result, in order to obtain this condition, we first investigated 32 observed statistically non-correlated Hubble datasets H(z) across redshift z, with H(z) [75,76,77,78,79,80,81,82] having errors (see Table 1). We used the following \(\chi ^{2}\)-test formula while fitting data:
Where N denotes the total amount of data, \(H_{ob},~H_{th}\), respectively, the observed and hypothesized datasets of H(z) and standard deviations are displayed by \(\sigma _{i}\).
For \(\Lambda \)CDM model, we have considered the Hubble function \(H(z)=H_{0}\sqrt{\Omega _{m0}(1+z)^{3}+\Omega _{\Lambda 0}}\) with \(\Omega _{\Lambda 0}=1-\Omega _{m0}\). Using this Hubble function, we have performed the MCMC analysis with 32 statistically non-correlated Hubble datasets H(z) with error bars in H(z). The output likelihood plots of \(H_{0}, \Omega _{m0}\) at \(68\%\), \(95\%\), and \(99\%\) confidence levels are given in Fig. 1 and the best fit Hubble curve for \(\Lambda \)CDM model is shown in Fig. 3. We have obtained the best fit value of Hubble constant as \(H_{0}=68.0_{-2.137}^{+2.110}\) km s\(^{-1}\) Mpc\(^{-1}\) by varying \(H_{0}\) in the range \(50<H_{0}<100\) and \(\Omega _{m0}\) in the range (0, 1) for \(\Lambda \)CDM model which is mentioned in Table 2.
The contour plots for model parameters \(c_{1}, c_{2}, \lambda ,\) and \(\omega \) at \(68\%\), \(95\%\), and \(99\%\) confidence levels, respectively, are shown in Fig. 2. The best fit shape of Hubble function for \(F(R, {\bar{T}})\)-model with H(z) datasets is shown in Fig. 3. As indicated in Table 2, we have selected a broad range of priors for our study in order to estimate the cosmological parameters, which have the highest likelihood of existing for the theoretical values of these parameters for the best-fit model. We have estimated best fit values of \(c_{1}=289.92_{-51.841}^{+57.915}\), \(c_{2}=9632_{-67.726}^{+69.668}, \lambda =0.12963_{-0.1255}^{+0.13399}\) and \(\omega =-0.036663_{-0.039458}^{+0.038194}\) at \(1-\sigma , 2-\sigma \) and \(3-\sigma \) errors using the priors (0, 800), (2000, 20000), \((-1, 1.2)\) and \((-1, 1)\), respectively. We have estimated the Hubble constant as \(H_{0}=64.3627_{-1.3408}^{+1.3291}~{\text {km s}}^{-1}\, {\text {Mpc}}^{-1}\) for the best fit model. Recently, Cao and Ratra [83] have obtained the value of Hubble constant \(H_{0}=69.8\pm 1.3~{\text {km s}}^{-1}\, {\text {Mpc}}^{-1}\) while in [84] they estimated this value as \(H_{0}=69.7\pm 1.2~{\text {km s}}^{-1}\, {\text {Mpc}}^{-1}\). Recently, Alberto Domínguez et al. [85] have obtained this parameter in their likelihood analysis of wide observational datasets as \(H_{0}=66.6\pm 1.6~{\text {km s}}^{-1}\, {\text {Mpc}}^{-1}\) and [86, 87] have obtained as \(H_{0}=65.8\pm 3.4~{\text {km s}}^{-1} \, {\text {Mpc}}^{-1}\). Freedman et al. [88] have estimated the present value of Hubble constant \(H_{0}=69.6\pm 0.8~{\text {km s}}^{-1} \, {\text {Mpc}}^{-1}\), Birrer et al. [89] have measured \(H_{0}=67.4_{-3.2}^{+4.1}~{\text {km s}}^{-1} \, {\text {Mpc}}^{-1}\), Boruah et al. [90] have measured \(H_{0}=69_{-2.8}^{+2.9}~{\text {km s}}^{-1} \, {\text {Mpc}}^{-1}\) and most recently, Freedman [91] has estimated \(H_{0}=69.8\pm 0.6~{\text {km s}}^{-1}\, {\text {Mpc}}^{-1}\) and Qin Wu et al. [92] have measured \(H_{0}=68.81_{-4.33}^{+4.99}~{\text {km s}}^{-1} \, {\text {Mpc}}^{-1}\). Recently, in 2018 [93], the Plank Collaboration estimated that the Hubble constant is currently \(H_{0}=67.4\pm 0.5\) km s\(^{-1}\) Mpc\(^{-1}\), while Riess et al. [94] obtained \(H_{0}=73.2\pm 1.3\) km s\(^{-1}\) Mpc\(^{-1}\) in 2021. In comparison of the above results, the result obtained in our model for \(H_{0}\) is compatible with observational datasets.
4.2 Apparent magnitude m(z)
The relationship between luminosity distance and redshift is one of the main observational techniques used to track the universe’s evolution. The expansion of the cosmos and the redshift of the light from distant brilliant objects are taken into consideration when calculating the luminosity distance (\(D_{L}\)) in terms of the cosmic redshift (z). It is provided as
where the radial coordinate of the source r, is established by
where we have used \( dt=dz/\dot{z}, \dot{z}=-H(1+z)\).
As a result, the luminosity distance is calculated as follows:
Hence, the apparent magnitude m(z) of a supernova is defined as:
We use the most recent collection of 1048 datasets of the Pantheon SNe Ia samples in the (\(0.01 \le z \le 1.7\)) range [95] in our MCMC analysis. We have used the following \(\chi ^{2}\) formula to constrain different model parameters:
The entire amount of data is denoted by N, the observed and theoretical datasets of m(z) are represented by \(m_{ob}\) and \(m_{th}\), respectively, and standard deviations are denoted by \(\sigma _{i}\).
The mathematical expression for apparent magnitude m(z) is represented in Eq. (34). Figure 4 depicts the likelihood analysis of Pantheon SNe Ia datasets for \(\Lambda \)CDM model and the best fit values of \(\Omega _{m0}\) are mentioned in Table 3. We have found the best fitted value of \(\Omega _{m0}=0.3337_{-0.01352}^{+0.02943}\) at minimum \(\chi ^{2}\) value with \(1-\sigma \), \(2-\sigma \) and \(3-\sigma \) errors at \(68\%\), \(95\%\) and \(99\%\) confidence level, respectively. Figure 5 shows the contour plots for \(c_{1}, c_{2}, \lambda , \omega , H_{0}\) in MCMC analysis of Pantheon SNe Ia datasets. Figure 6 depicts the best fit curve of apparent magnitude versus z for Pantheon SNe Ia datasets for the best fit values of model parameters. We have applied a wide range priors \((0, 500), (1000, 10000), (-1, 2), (-1, 1), (50, 100)\) for \(c_{1}, c_{2}, \lambda , \omega , H_{0}\), respectively, in our analysis and obtained the best fit values as \(c_{1}=294.8_{-0.1282}^{+0.1279}, c_{2}=9625_{-0.1281}^{+0.1286}, \lambda =0.2486_{-0.1596}^{+0.1090}, \omega =0.01065_{-0.1128}^{+0.1528}, H_{0}=67.87_{-0.1290}^{+0.1281}\) with \(1-\sigma \), \(2-\sigma \) and \(3-\sigma \) errors at \(68\%\), \(95\%\) and \(99\%\) confidence level, respectively (see Table 3). Our result is compatible with the recent observational datasets.
5 Result analysis and discussion
In this section, first we introduce matter energy density parameter \(\Omega _{m}\) and effective dark energy density parameter \(\Omega _{MG}\), respectively as
From Eq. (19), we can define the relationship between energy density parameters \(\Omega _{m}\) and \(\Omega _{MG}\) as
Equation (35) represents the expressions for matter energy density parameter \(\Omega _{m}\) and effective dark energy density parameter \(\Omega _{MG}\), respectively. The geometrical evolution of \(\Omega _{m}\), \(\Omega _{MG}\), respectively are shown in Fig. 7a, b. Figure 7a depicts that the early universe is matter dominated \(\lim _{z\rightarrow \infty }\Omega _{m}\rightarrow 1\) and in late-time universe \(\lim _{z\rightarrow -1}\Omega _{m}\rightarrow 0\). Figure 7b depicts that late-time universe is dark energy dominated \(\lim _{z\rightarrow -1}\Omega _{MG}{\rightarrow }1\) and in early time universe \(\lim _{z\rightarrow \infty }\Omega _{MG}{\rightarrow }0\). At present \(z{=}0\), we have estimated values of these parameters as \((\Omega _{m0}, \Omega _{MG0})=(0.3767_{-0.0559}^{+0.0620}, 0.6233_{-0.0018}^{+0.0016}), (0.2831_{-0.0156}^{+0.0294}, 0.7169_{-0.0041}^{+0.0020})\), respectively, along two observational datasets H(z) and Pantheon SNe Ia datasets while for the standard \(\Lambda \)CDM model, these quantities are obtained as \(\Omega _{m0}=0.322_{-0.03846}^{+0.04403}, 0.3337_{-0.01352}^{+0.02943}\) with Hubble constant \(H_{0}=68.0_{-2.137}^{+2.110}\) km s\(^{-1}\) Mpc\(^{-1}\). These values are compatible with recent observations [83,84,85,86,87,88]. The good observations in our model are the effective dark energy term that comes from the geometrical corrections.
The effective dark energy equation of state parameter \(\omega _{de}\) is obtained as
or
The mathematical expression for effective dark energy EoS parameter \(\omega _{de}\) is represented in Eq. (38) and its geometrical behaviour is shown in Fig. 8. From Fig. 8, we can see that effective dark energy EoS varies as \(-1\le \omega _{de}\le -0.6787\) along H(z) datasets, \(-1\le \omega _{de}\le -0.5795\) along Pantheon datasets and \(-1\le \omega _{de}\le -0.5176\) for \(\Lambda \)CDM model, over the redshift \(-1\le z \le 3\). At \(z=0\), we have measured the value of EoS \(\omega _{de}=-0.7552_{-0.0109}^{+0.0079}, -0.7583_{-0.0018}^{+0.0103}\), respectively, along two observational datasets and for \(\Lambda \)CDM model it is estimated as \(\omega _{de}=-0.85\). Also from Fig. 8, we observe that \(\omega _{de}\rightarrow -1\) as \(z\rightarrow -1\) (at late-time universe) for all datasets. Thus, these behaviours of effective dark energy EoS parameter \(\omega _{de}\) confirm that our model is in good agreement with observational datasets, and our derived \(F(R,{\bar{T}})\) model is very closed to \(\Lambda \)CDM standard cosmological model.
The expression for deceleration parameter q(z) is represented in Eq. (30) and its geometrical nature is depicted in Fig. 9. From Fig. 9, we observe that \(\lim _{z\rightarrow -1}q\rightarrow -1\) (accelerating phase of late-time universe) and \(\lim _{z\rightarrow \infty }q\rightarrow \frac{1+3\omega }{2}>0\) (decelerating phase of early universe) that reveals that for to obtain past decelerating universe the perfect fluid equation of state parameter should be \(\omega >-\frac{1}{3}\). At present (\(z=0\)) we have estimated the value of deceleration parameter \(q_{0}=-0.2295_{-0.0226}^{+0.0218}, -0.2590_{-0.0455}^{+0.0372}\), respectively along two observational datasets H(z) and Pantheon SNe Ia and for \(\Lambda \)CDM standard model, it is obtained as \(q_{0}=-0.55\), and this reveals that the present phase of the expanding universe is accelerating which is in good agreement with recent observations. From Fig. 9, one can see that evolution of q(z) shows a signature-flipping (transition) point called as transition redshift \(z_{t}\) at which \(q=0\) i.e., the expansion of universe is in accelerating phase for \(z<z_{t}\) and it is in decelerating expansion phase for \(z>z_{t}\). The general expression for \(z_{t}\), we have derived from Eq. (30) as below
In the derived model, we have measured the transition redshift as \(z_{t}=0.4438_{-0.790}^{+0.1008}, 0.3651_{-0.0904}^{+0.1644}\), respectively, for two observational datasets H(z) and Pantheon SNe Ia, while for standard \(\Lambda \)CDM model, it is obtained as \(z_{t}=0.671\). From Eq. (34), we can obtain ever accelerating universe for \(\omega \rightarrow -1\) as \(z_{t}\rightarrow \infty \). Recently in 2013, Farooq and Ratra [96] have measured this decelerating-accelerating transition redshifts \(z_{t}=0.74\pm 0.05\) while Farooq et al. [97] have estimated as \(z_{t}=0.74\pm 0.04\). In 2016, Farooq et al. [98] have measured this transition redshifts \(z_{t}=0.72\pm 0.05\) and in 2018, Yu et al. [99] have suggested this transition redshifts varies over \(0.33< z_{t} < 1.0\). Thus, the decelerating-accelerating transition redshift \(z_{t}=0.4438_{-0.790}^{+0.1008}, 0.3651_{-0.0904}^{+0.1644}\) measured in our model is in good agreement with the results obtained in [96,97,98,99,100,101].
5.1 Om diagnostic analysis
It is simpler to classify concepts related to cosmic dark energy because of the behavior of Om diagnostic function [102]. For a spatially homogeneous universe, the Om diagnostic function is given as
where \(H_{0}\) denotes the current value of the Hubble parameter H(z) as stated in Eq. (29). A negative slope of Om(z) indicates quintessence motion, whereas a positive slope denotes phantom motion. The \(\Lambda \)CDM model is represented by the constant Om(z).
Using Eq. (29) in (40), we get
The mathematical expression for Om(z) function is represented in Eq. (41) and its geometrical behaviour is shown in Fig. 10. From Fig. 10, we observe that the slopes are negative along the both datasets H(z) datasets and Pantheon SNe Ia datasets, during evolution of the universe and hence, our model behaves just like quintessence dark energy model. At late-time \(\lim _{z\rightarrow -1}Om(z)\rightarrow \left[ 1-\frac{c_{1}^{2}}{36(1+\lambda )^{2}H_{0}^{2}}\right] \) which is a constant and it indicates that our model tends to \(\Lambda \)CDM model in late-time scenario.
5.2 Age of the universe
We define the age of the universe as
where H(z) is given by Eq. (29). Using this in (42), we have
We can see that as \(z\rightarrow \infty \), \((t_{0}-t)\) tends to a constant value that represents the cosmic age of the universe, \((t_{0}-t)\rightarrow t_{0}=0.0141602_{-0.0000655}^{+0.0001027}, 0.0122838_{-0.0002805}^{+0.0006345}\), respectively, along two datasets H(z) and Pantheon SNe Ia. The present cosmic age of the universe, we have measured as \(t_{0}=13.8486_{-0.0640}^{+0.1005}, 12.0135_{-0.2743}^{+0.6206}\) Gyrs, respectively along two observational datasets, which are very closed to observational estimated values and estimated \(\Lambda \)CDM value \(t_{0}=13.3895_{-0.1129}^{+0.1240}\) Gyrs. Recently [103, 104] have measured present age of the universe as \(t_{0}\approx 13.87\) Gyrs.
5.3 Information criteria
It is critical to understand information criteria (IC) in order to assess a model’s level of reliability. One often used tool for this work is the Akaike Information Criterion (AIC) [105,106,107,108,109]. When we utilize more data, AIC provides a reasonable approximation of the divergence between a model’s predictions and reality. The Bayesian Information Criterion (BIC) [110,111,112] is another factor that restricts complex models more. These AIC and BIC criteria are interpreted as [113]
For both scenarios, n represents the count of independent fitting parameters, whereas N represents the number of data points utilized in the analysis. In order to assess the efficacy of a dynamical dark energy (DE) model in comparison to the \(\Lambda \)CDM model in accurately characterizing the entire dataset, we calculate the pairwise differences \(\Delta \)AIC and \(\Delta \)BIC with regards to the model. The greater these disparities, the stronger the evidence against the model with a higher value of AIC (BIC)-the \(\Lambda \)CDM, in this instance. When the values of \(\Delta \)AIC and/or \(\Delta \)BIC fall between (0, 2) then confronted models are consistent to each other while their values in the range 6 and 10, it is appropriate to assert that there is “strong evidence” against the model. If the values exceed 10, it is considered “very strong evidence” [114, 115].
Tables 4 and 5 represent the scenarios of information criteria for H(z) datasets and Pantheon SNe Ia datasets analysis. From Tables 4 and 5, we can see that \(\Delta {AIC}=1.6605\) for H(z) datasets and \(\Delta {AIC}=1.7677\) for Pantheon datasets in the comparison of \(\Lambda \)CDM model which indicates that our derived \(F(R,\bar{T})\) model is favored by datasets to be consistent with \(\Lambda \)CDM model while the values of \(\Delta {BIC}=3.5243\) for H(z) datasets which is greater than 2 and this indicates that our derived model is less favored with \(\Lambda \)CDM model. From Table 5, we have \(\Delta {BIC}=13.9970\) for Pantheon SNe Ia datasets which is greater than 10 that reveals that our derived model is strongly disfavored to be consistent with \(\Lambda \)CDM model.
6 Conclusions
We study exact cosmological models in \(F(R,{\bar{T}})\) gravity theory in the current paper. The arbitrary function \(F(R, {\bar{T}})=R+\lambda {\bar{T}}\) has been investigated, in which R represents the Ricci-scalar curvature, \({\bar{T}}\) is the torsion scalar in the context of generalized connection \(\Gamma \), and \(\lambda \) is an arbitrary constant. After solving the field equations in a flat FLRW spacetime manifold for the Hubble parameter, we estimated the best fit values of the model parameters with \(1-\sigma , 2-\sigma \), and \(3-\sigma \) regions by utilizing the MCMC analysis. We have conducted a model discussion and outcome analysis using these best fit model parameter conditions. For the best fit shape of Hubble function H(z), we have found the values of model parameters as \(c_{1}=289.92_{-51.841}^{+57.915}\), \(c_{2}=9632_{-67.726}^{+69.668}, \lambda =0.12963_{-0.1255}^{+0.13399}\) and \(\omega =-0.036663_{-0.039458}^{+0.038194}\) at \(1-\sigma , 2-\sigma \) and \(3-\sigma \) errors for H(z) datasets, and \(c_{1}=294.8_{-0.1282}^{+0.1279}, c_{2}=9625_{-0.1281}^{+0.1286}, \lambda =0.2486_{-0.1596}^{+0.1090}, \omega =0.01065_{-0.1128}^{+0.1528}, H_{0}=67.87_{-0.1290}^{+0.1281}\) with \(1-\sigma \), \(2-\sigma \) and \(3-\sigma \) errors at \(68\%\), \(95\%\) and \(99\%\) confidence level, respectively, for Pantheon SNe Ia datasets (see Tables 2, 3). We have also find the best fit value of Hubble constant for \(\Lambda \)CDM model with statistically non-correlated H(z) datasets as \(H_{0}=68.0_{-2.137}^{+2.110}\) km s\(^{-1}\) Mpc\(^{-1}\). In the analysis of deceleration parameter q(z), our universe model shows a transit phase dark energy model that is decelerating \(q>0\) for \(z>z_{t}\) and accelerating \(q<0\) for \(z<z_{t}\). We have found the transition redshift \(z_{t}=0.4438_{-0.790}^{+0.1008}, 0.3651_{-0.0904}^{+0.1644}\), respectively for two observational datasets H(z) and Pantheon. We have found the present value of DP as \(q_{0}=-0.2295_{-0.0226}^{+0.0218}, -0.2590_{-0.0455}^{+0.0372}\) with Hubble constant \(H_{0}=64.3627_{-1.3408}^{+1.3291}, 67.87_{-0.1290}^{+0.1281}~{\text {km s}}^{-1}\, {\text {Mpc}}^{-1}\), respectively, for two datasets. The Om diagnostic analysis of H(z) indicates that the current behaviour of our model is quintessential and late-time it approaches to \(\Lambda \)CDM model. We have found that \((\Omega _{m}, \Omega _{MG}){\rightarrow }(0, 1)\) at late-time which is good observations for our model. We have found the present values of total energy density parameters as \((\Omega _{m0}, \Omega _{MG0})=(0.3767_{-0.0559}^{+0.0620}, 0.6233_{-0.0018}^{+0.0016}), (0.2831_{-0.0156}^{+0.0294}, 0.7169_{-0.0041}^{+0.0020})\), respectively, along two observational datasets H(z) and Pantheon SNe Ia datasets while for standard \(\Lambda \)CDM model, these quantities are as \(\Omega _{m0}=0.322^{+0.04403}_{-0.03846}, 0.3337^{+0.02943}_{-0.01352}\) respectively along two observational datasets. We have found that the effective dark energy EoS parameter varies as \(-1\le \omega _{de}\le -0.6787\) along H(z) datasets, \(-1\le \omega _{de}\le -0.5795\) along Pantheon datasets and \(-1\le \omega _{de}\le -0.5176\) for \(\Lambda \)CDM model, over the redshift \(-1\le z \le 3\). At \(z=0\), we have measured the value of EoS \(\omega _{de}=-0.7552_{-0.0109}^{+0.0079}, -0.7583_{-0.0018}^{+0.0103}\), respectively, along two observational datasets and for \(\Lambda \)CDM model it is estimated as \(\omega _{de}=-0.85\) with \(\omega _{de}\rightarrow -1\) as \(z\rightarrow -1\) at late-time universe. We have found the present age of the universe for our derived \(F(R,{\bar{T}})\) model as \(t_{0}=13.8486_{-0.0640}^{+0.1005}, 12.0135_{-0.2743}^{+0.6206}\) Gyrs, respectively along two observational datasets, which are very closed to observational estimated values and estimated \(\Lambda \)CDM value \(t_{0}=13.3895_{-0.1129}^{+0.1240}\) Gyrs. We have also, analyzed the Information Criterion AIC and BIC to compare of derived model with \(\Lambda \)CDM model. We have found that the H(z) datasets analysis is favored our derived model to be consistent with \(\Lambda \)CDM model while the Pantheon datasets is less supported.
Thus, we have found that the above derived \(F(R,{\bar{T}})\) gravity model can describe the accelerated phase of expanding universe without introducing the dark energy term \(\Lambda \). The results of \(F(R,{\bar{T}})\) gravity model is extremely very similar and closed to \(\Lambda \)CDM standard cosmological model but without introducing cosmological constant \(\Lambda \)-term. Also, we can recover the original Friedmann model without \(\Lambda \)-term from \(F(R,{\bar{T}})\) gravity model by substituting \(\lambda =0, c_{1}=0\). This \(F(R,{\bar{T}})\) gravity theory is the generalization of both F(R) and \(F({\bar{T}})\) gravity theory. Thus, the present modified gravity model is interesting and attracts to researcher in this field to re-investigate it for exploring the hidden cosmological properties of this \(F(R,{\bar{T}})\) gravity theory.
Data Availability Statement
This manuscript has no associated data. [Author’s comment: Data sharing not applicable to this article as no datasets were generated or analysed during the current study].
Code Availability
The manuscript has no associated code/software. [Author’s comment: Code/Software sharing not applicable to this article as no code/software was generated or analysed during the current study].
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This work was supported by the Ministry of Science and Higher Education of the Republic of Kazakhstan, Grant AP14870191. The authors are thankful to renowned Reviewers/Editors for their valuable suggestion to improve this manuscript.
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Maurya, D.C., Myrzakulov, R. Transit cosmological models in \(F(R,{\bar{T}})\) gravity theory. Eur. Phys. J. C 84, 534 (2024). https://doi.org/10.1140/epjc/s10052-024-12904-5
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DOI: https://doi.org/10.1140/epjc/s10052-024-12904-5