Phantom Dark Energy Nature of String-Fluid Cosmological Models in \(\boldsymbol{f(Q)}\)-Gravity

IF 1.2 4区 物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS Gravitation and Cosmology Pub Date : 2023-11-23 DOI:10.1134/S0202289323040151
Dinesh Chandra Maurya
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Abstract

The present investigation is focused on a curvatureless and torsionless modified nonmetricity theory of gravity in the context of string fluid. For that, we use an anisotropic, locally rotationally symmetric (LRS), Bianchi Type I space-time universe with the arbitrary function \(f(Q)=Q+\Lambda\), where \(Q\) is the nonmetricity scalar and \(\Lambda\) is the cosmological constant. We solve the field equations using a time-dependent deceleration parameter and obtain various cosmological parameters. To obtain the best-fit values of the model parameters, we use the observational constraints on Hubble function \(H(z)\) and the apparent magnitude \(m(z)\) using the observational datasets \(H(z)\) and SNe Ia. Using these values of model parameters, we investigate cosmological scenarios of the model. We observe the behavior of the variable dark energy equation of state (EoS) parameter \(\omega\) in the context of a string fluid universe and find the present value of the effective EoS parameter \(\omega^{\textrm{eff}}<-1\) that corresponds to phantom dark energy. Also, we analyze the statefinder parameters and estimate the present age of the universe.

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\(\boldsymbol{f(Q)}\) -重力中弦流体宇宙学模型的幻影暗能量性质
本文主要研究了管柱流体中无曲率和无扭转的修正非规性重力理论。为此,我们使用了一个各向异性、局部旋转对称(LRS)的Bianchi I型时空宇宙,它具有任意函数\(f(Q)=Q+\Lambda\),其中\(Q\)是非度量标量,\(\Lambda\)是宇宙学常数。我们利用随时间变化的减速参数求解了场方程,得到了各种宇宙学参数。为了获得模型参数的最佳拟合值,我们利用观测数据集\(H(z)\)和SNe Ia对哈勃函数\(H(z)\)和视星等\(m(z)\)进行了观测约束。利用这些模型参数值,我们研究了模型的宇宙学情景。我们观察了弦流体宇宙中可变暗能量状态方程(EoS)参数\(\omega\)的行为,并找到了对应于幻相暗能量的有效EoS参数\(\omega^{\textrm{eff}}<-1\)的现值。此外,我们分析了状态探测器的参数,并估计了宇宙的年龄。
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来源期刊
Gravitation and Cosmology
Gravitation and Cosmology ASTRONOMY & ASTROPHYSICS-
CiteScore
1.70
自引率
22.20%
发文量
31
审稿时长
>12 weeks
期刊介绍: Gravitation and Cosmology is a peer-reviewed periodical, dealing with the full range of topics of gravitational physics and relativistic cosmology and published under the auspices of the Russian Gravitation Society and Peoples’ Friendship University of Russia. The journal publishes research papers, review articles and brief communications on the following fields: theoretical (classical and quantum) gravitation; relativistic astrophysics and cosmology, exact solutions and modern mathematical methods in gravitation and cosmology, including Lie groups, geometry and topology; unification theories including gravitation; fundamental physical constants and their possible variations; fundamental gravity experiments on Earth and in space; related topics. It also publishes selected old papers which have not lost their topicality but were previously published only in Russian and were not available to the worldwide research community
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