从修正的f(R, T)引力看各向异性时空中的宇宙演化

IF 1.9 4区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY
Pramana Pub Date : 2023-01-13 DOI:10.1007/s12043-022-02492-y
S Noori Gashti, J Sadeghi
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引用次数: 1

摘要

本文从f(R, T)引力的扩展理论出发,以物质场为粘性流体,评价了各向异性时空中的加速宇宙学模型。采用一个可变的哈勃参数,研究了与红移有关的动态参数和粘滞系数的影响。通过使用运动方程显式计算能量密度,我们根据不同变量的红移z检查这些值的变化。通过数学方法建立了模型,其运动参数方程表现出了晚时宇宙加速时的典型行为。我们计算了其他能量条件,即NEC、WEC和SEC,评估了它们随宇宙时间的变化。最后,我们将这些量与来自普朗克和WMAP7探测器的最新可观测数据进行比较。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Cosmic evolution in the anisotropic space–time from modified f(R, T) gravity

In light of an expanded theory of f(RT) gravity with the matter field as a viscous fluid, this paper evaluated an accelerated cosmology model in the anisotropic space–time. A variable Hubble parameter was used to investigate dynamic parameters concerning red-shift and the effect of the viscous coefficient. By explicitly calculating the energy density using the equations of motion, we examine the variations of these values in terms of red-shift z for different variables. The model is formed by a mathematical method, and the equation of motion parameter shows a quintessence behaviour at the late-time cosmic acceleration. We calculate the other energy conditions, i.e., NEC, WEC and SEC, evaluating their changes with cosmic time. Finally, we compare the quantities with the latest observable data, from the Planck and WMAP7 probes.

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来源期刊
Pramana
Pramana 物理-物理:综合
CiteScore
3.60
自引率
7.10%
发文量
206
审稿时长
3 months
期刊介绍: Pramana - Journal of Physics is a monthly research journal in English published by the Indian Academy of Sciences in collaboration with Indian National Science Academy and Indian Physics Association. The journal publishes refereed papers covering current research in Physics, both original contributions - research papers, brief reports or rapid communications - and invited reviews. Pramana also publishes special issues devoted to advances in specific areas of Physics and proceedings of select high quality conferences.
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