Cosmic acceleration and energy conditions in symmetric teleparallel f(Q) gravity

Koussour, M.; Shekh, S. H.; Bennai, M.

doi:10.1016/j.jheap.2022.05.002

Cited by 50 publications

(15 citation statements)

References 37 publications

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“…Finally, it is possible to see that the behavior of the EoS parameter in our model corresponds to the models presented in the literature. [ 29–31 ]…”

Section: Cosmological Ffalse(qfalse)$f(q)$ Modelmentioning

confidence: 99%

A New Parametrization of Hubble Parameter in f(Q)$f(Q)$ Gravity

Koussour

Pacif

Bennai

et al. 2023

Fortschritte der Physik

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In this paper, we examine the accelerated expansion of the Universe at late‐time in the framework of ffalse(Qfalse)$f(Q)$ gravity theory in which the non‐metricity scalar Q describes the gravitational interaction. To this, we propose a new parametrization of the Hubble parameter using a model‐independent way and apply it to the Friedmann equations in the FLRW Universe. Then we estimate the best fit values of the model parameters by using the combined datasets of updated Hfalse(zfalse)$H(z)$ consisting of 57 points, the Pantheon consisting of 1048 points, and BAO datasets consisting of six points with the Markov Chain Monte Carlo (MCMC) method. The evolution of deceleration parameter indicates a transition from the deceleration to the acceleration phase of the Universe. In addition, we investigate the behavior of statefinder analysis and Om diagnostic parameter, Further, to discuss other cosmological parameters, we consider a ffalse(Qfalse)$f(Q)$ model, specifically, f(Q)=Q+mQn$f(Q) =Q+mQ^{n}$, where m and n are free parameters. Finally, we find that the model supports the present accelerating Universe, and the EoS parameter behaves like the quintessence model.

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“…Finally, it is possible to see that the behavior of the EoS parameter in our model corresponds to the models presented in the literature. [ 29–31 ]…”

Section: Cosmological Ffalse(qfalse)$f(q)$ Modelmentioning

confidence: 99%

A New Parametrization of Hubble Parameter in f(Q)$f(Q)$ Gravity

Koussour

Pacif

Bennai

et al. 2023

Fortschritte der Physik

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“…[27][28][29][30]. 5 Various aspects of modifications of these theories have been considered in the recent literature [34][35][36][37][38][39][40][41][42][43], and the energy and the entropy might be further interesting aspects to consider in the future [44][45][46][47][48].…”

Section: Formalismmentioning

confidence: 99%

Energy and entropy in the Geometrical Trinity of gravity

Gomes¹,

Jiménez²,

Koivisto³

2022

Preprint

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All energy is gravitational energy. That is the consequence of the equivalence principle, according to which gravity is the universal interaction. The physical charges of this interaction have remained undisclosed, but the Advent of the Geometrical Trinity opened a new approach to this foundational problem. Here it is shown to provide a background-independent unification of the previous, noncovariant approaches of Bergmann-Thomson, Cooperstock, Einstein, von Freud, Landau-Lifshitz, Papapetrou and Weinberg. First, the Noether currents are derived for a generic Palatini theory of gravity coupled with generic matter fields, and then the canonical i.e. the unique charges are robustly derived and analysed, particularly in the metric teleparallel and the symmetric teleparallel versions of General Relativity. These results, and their application to black holes and gravitational waves, are new.

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“…Using the hybrid expansion law of the scale factor which leads to the time-redshift relation in the form of the Lambert function i.e. t(z) = nt 0 m g(z) that has been studied in several modified theories of gravity [37,38], we have analyzed the various cosmological parameters like deceleration parameter, energy density, pressure, and the equation of state (EoS) parameter with the energy conditions for our cosmological model. In addition, we try to constrain the model parameters using the recent 57 Hubble datasets points by minimizing the chi-square function.…”

Section: Introductionmentioning

confidence: 99%

Quintessence Universe and cosmic acceleration in f (Q, T) gravity

Koussour

Myrzakulov

Shekh

et al. 2022

Int. J. Mod. Phys. D

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The problem of cosmic acceleration and dark energy is one of the mysteries presently posed in the scientific society that general relativity has not been able to solve. In this work, we have considered alternative models to explain this late-time acceleration in a flat Friedmann-Lemaitre-Robertson-Walker (FLRW) Universe within the framework of the f (Q, T) modified gravity theory (where Q is the non-metricity and T is the trace of the energy-momentum tensor) recently proposed by Xu et al. (Eur. Phys. J. C 79 (2019) 708), which is an extension of f (Q) gravity with the addition of the T term. Here, we presume a specific form of f (Q, T) = αQ + βQ 2 + γT where α, β and γ are free model parameters, and obtained the exact solutions by assuming the cosmic time-redshift relation as t(z) = nt 0 m g(z) which produces the Hubble parameter of the form H(z) = mH 0 m+n 1 g(z) + 1 where m and n are the non-negative constants, we find the best values for them using 57 data points of the Hubble parameter H (z). Also, we find the behavior of different cosmological parameters as the deceleration parameter q , energy density ρ , pressure p and EoS parameter (ω) and compare them with the observational results. To ensure the validity of the results, we studied the energy conditions along with jerk parameter. Finally, we found that our model behaves similarly to the quintessence Universe.

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Cosmic acceleration and energy conditions in symmetric teleparallel f(Q) gravity

Cited by 50 publications

References 37 publications

A New Parametrization of Hubble Parameter in f(Q)$f(Q)$ Gravity

A New Parametrization of Hubble Parameter in f(Q)$f(Q)$ Gravity

Energy and entropy in the Geometrical Trinity of gravity

Quintessence Universe and cosmic acceleration in f (Q, T) gravity

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