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LRS Bianchi type-I bouncing cosmological models in f(R,T) gravity
International Journal of Geometric Methods in Modern Physics ( IF 1.8 ) Pub Date : 2020-09-16 , DOI: 10.1142/s0219887820502035
Vinod Kumar Bhardwaj 1 , Archana Dixit 1
Affiliation  

In this work, we have investigated the cosmological bouncing solution in LRS Bianchi-I space-time in framework of [Formula: see text] gravity. Our study in this paper is based on the modeling of matter bounce scenario in which the universe starts with a matter-dominated contraction phase and transitions into an ekpyrotic phase. Mathematical simulations have been done in the modified general theory of relativity in the form of [Formula: see text] theory proposed by Harko et al. [f(R, T) gravity, Phys. Rev. D 84 (2011) 024020], whose functional form is as [Formula: see text] where [Formula: see text] is Ricci scalar, [Formula: see text] is trace of energy–momentum tensor and [Formula: see text] is constant. Taking the non-vanishing scale factor in LRS Bianchi-I space-time, the geometrical parameters such as Hubble parameter and deceleration parameter have been derived and their subsequent use in the expression of pressure, density and EoS parameter [Formula: see text] confirms qualitatively the initial conditions of the universe at the bounce. With the non-vanishing nature of scale factor, initial universe in finite means ruled out the initial singularity problem. The analysis of violation of energy conditions near the bouncing region and stability of the model shows that the matter bounce approach is highly unstable at the bounce but the rapid decay of perturbations away from the bounce supports the stability of the model.

中文翻译:

在 f(R,T) 重力下的 LRS Bianchi I 型弹跳宇宙学模型

在这项工作中,我们研究了 [公式:见文本] 重力框架下 LRS Bianchi-I 时空的宇宙学弹跳解。我们在本文中的研究基于物质反弹场景的建模,其中宇宙从物质主导的收缩阶段开始并过渡到火热阶段。数学模拟已经在修正的广义相对论中以 Harko 等人提出的 [公式:见正文] 理论的形式进行。[f(R, T) 重力,物理。Rev. D 84 (2011) 024020],其函数形式为[公式:见文本]其中[公式:见文本]是里奇标量,[公式:见文本]是能量-动量张量的迹,[公式:见文本] text] 是恒定的。取LRS Bianchi-I时空的非零比例因子,哈勃参数和减速参数等几何参数已经推导出来,它们随后用于表达压力、密度和 EoS 参数 [公式:见正文] 定性地证实了宇宙在反弹时的初始条件。由于尺度因子的非零性质,有限均值的初始宇宙排除了初始奇点问题。对反弹区域附近能量条件的破坏和模型稳定性的分析表明,物质反弹方法在反弹时高度不稳定,但远离反弹的扰动快速衰减支持了模型的稳定性。见正文]定性地证实了宇宙在反弹时的初始条件。由于尺度因子的非零性质,有限均值的初始宇宙排除了初始奇点问题。对反弹区域附近能量条件的破坏和模型稳定性的分析表明,物质反弹方法在反弹时高度不稳定,但远离反弹的扰动快速衰减支持了模型的稳定性。见正文]定性地证实了宇宙在反弹时的初始条件。由于尺度因子的非零性质,有限均值的初始宇宙排除了初始奇点问题。对反弹区域附近能量条件的破坏和模型稳定性的分析表明,物质反弹方法在反弹时高度不稳定,但远离反弹的扰动快速衰减支持了模型的稳定性。
更新日期:2020-09-16
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