Cosmic jerk parameter in symmetric teleparallel cosmology

Koussour, M.; Dahmani, Safae; Bennai, M.; Ouali, Taoufik

doi:10.1140/epjp/s13360-023-03827-3

Cited by 10 publications

(12 citation statements)

References 58 publications

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“…In this study, we utilize a simplified BAO dataset comprising six points for d A (z)/D V (z BAO ), sourced from references [36,[41][42][43][44][45][46][53][54][55]59], where the redshift of photon decoupling is denoted as z ≈ 1091. Here, d A (z) represents the co-moving angular diameter distance, and The chi-square function corresponding to the Baryon Acoustic Oscillation (BAO) dataset is provided by [55].…”

Section: Baryon Acoustic Oscillationmentioning

confidence: 99%

Cosmological Dynamics of Accelerating model in f(Q) gravity: A Parametric Approach

Bhardwaj,

Grag,

Prakash

2024

Preprint

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In the current study, we have considered three different parameterizations of deceleration parameter to describe the cosmological dynamics of the accelerating universe in f(Q) gravity. The power law symmetric teleparallel gravity with a specific form f(Q)= Q + nQm is assumed for the modelling purpose. Here, m and n are constants and Q is the non-metricity term that describes the gravitational interaction in space time. We constructed the field equations depending on power law f(Q) gravity and parameters are extracted using experimental observations. Latest observational datasets of BAO, H(z) and Pantheon are utilized to predict the best fit values of parameters and current value of Hubble constant. The Markov Chain Monte Carlo (MCMC) algorithm has been used to decide the best plausible values of parameters. We numerically represent the physical and geometrical features of the models and thoroughly explore their development. We analyzed our models using the jerk and Om diagnosis that depict the derived cosmic models are different from the ΛCDM model expressing late time accelerated expansion of cosmos with phantom type of universe. We also discussed the viability of models by the analysis of energy conditions.

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Section: Baryon Acoustic Oscillationmentioning

confidence: 99%

Cosmological Dynamics of Accelerating model in f(Q) gravity: A Parametric Approach

Bhardwaj,

Grag,

Prakash

2024

Preprint

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“…equation (34), suggests that the trajectories lie along the µ-direction. Despite this, the physical properties of the asymptotic solution, such as the deceleration parameter, remain unchanged.…”

Section: Stability Propertiesmentioning

confidence: 99%

“…f (Q)-theory has been widely studied by cosmologists because it can provide an alternative geometric mechanism for describing cosmological phenomena [25]. For various applications of symmetric teleparallel theory we refer the reader to [26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44] and references therein. Recently, in [45] a detailed analysis for the evolution of cosmological parameters performed within the framework of f (Q)-gravity for a spatially flat FLRW universe.…”

Section: Introductionmentioning

confidence: 99%

Stability Properties of Self-Similar Solutions in Symmetric Teleparallel f(Q)-Cosmology

Paliathanasis

2023

Symmetry

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Self-similar cosmological solutions correspond to spacetimes that admit a homothetic symmetry. The physical properties of self-similar solutions can describe important eras of the cosmological evolution. Recently, self-similar cosmological solutions were derived for symmetric teleparallel fQ-theory with different types of connections. In this work, we study the stability properties of the self-similar cosmological solutions in order to investigate the effects of the different connections on the stability properties of the cosmic history. For the background geometry, we consider the isotropic Friedmann–Lemaître–Robertson–Walker space and the anisotropic and homogeneous Bianchi I space, for which we investigate the stability properties of Kasner-like universes.

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“…This implies that while

\frac{\sigma }{\theta }

is constant, the Hubble expansion of the Universe can attain isotropic. [ 49–55 ] This condition leads to

A(t) =B(t) ^{\gamma }

, where

\gamma \ne 1

is an arbitrary constant. When

\gamma =1

, the model becomes isotropic.…”

Section: Field Equations Of Lrs Bianchi‐i Cosmology In Ffalse(qtfalse...mentioning

confidence: 99%

Observational Constraints on Hybrid Scale Factor in f(Q,T)$f(Q,T)$ Gravity with Anisotropic Space‐Time

2023

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In this paper, we present an accelerating cosmological model by constraining the free parameters using the cosmological datasets in an extended symmetric teleparallel gravity for the flat and anisotropic space-time. We employ a time variable deceleration parameter that behaves early deceleration and late time acceleration in the form of hybrid scale factor (HSF). We obtain the present values of deceleration parameter and analyse the late time behavior of the Universe based on the best-fit values of free parameters. We derive the dynamical parameters of the model and obtain the equation of state parameter at present in the quintessence region; however at late time it approaches to ΛCDM. The energy conditions are also analysed to validate the modified gravity and we find that strong energy condition is violating. We establish the importance of hybrid scale factor in the late time cosmic phenomena issue.

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Cosmic jerk parameter in symmetric teleparallel cosmology

Cited by 10 publications

References 58 publications

Cosmological Dynamics of Accelerating model in f(Q) gravity: A Parametric Approach

Cosmological Dynamics of Accelerating model in f(Q) gravity: A Parametric Approach

Stability Properties of Self-Similar Solutions in Symmetric Teleparallel f(Q)-Cosmology

Observational Constraints on Hybrid Scale Factor in f(Q,T)$f(Q,T)$ Gravity with Anisotropic Space‐Time

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