Density Perturbation and Cosmological Evolution in the Presence of Magnetic Field in $f (R)$

IF 1.5 4区物理与天体物理 Q3 PHYSICS, PARTICLES & FIELDS

Advances in High Energy Physics Pub Date : 2022-05-23 DOI:10.1155/2022/5195251

S. Chakraborty, S. Guha

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Abstract

In this paper, we have investigated the density perturbations and cosmological evolution in the FLRW universe in the presence of a cosmic magnetic field, which may be assumed to mimic primordial magnetic fields. Such magnetic fields have sufficient strength to influence galaxy formation and cluster dynamics, thereby leaving an imprint on the CMB anisotropies. We have considered the FLRW universe as a representative of the isotropic cosmological model in the 1 + 3 covariant formalism for f R gravity. The propagation equations have been determined and analyzed, where we have assumed that the magnetic field is aligned uniformly along the x -direction, resulting in a diagonal shear tensor. Subsequently, the density perturbation evolution equations have been studied, and the results have been interpreted. We have also indicated how these results change in the general relativistic case and briefly mentioned the expected change in higher-order gravity theories.

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fR中存在磁场时的密度微扰和宇宙学演化

在本文中，我们研究了FLRW宇宙中存在宇宙磁场的密度扰动和宇宙学演化，宇宙磁场可以被假设为模拟原始磁场。这样的磁场有足够的强度来影响星系的形成和星系团的动力学，从而在CMB的各向异性上留下印记。我们已经考虑了FLRW宇宙作为各向同性宇宙学模型的代表，在1 + 3协变形式的f R重力。我们已经确定并分析了传播方程，其中我们假设磁场沿x方向均匀排列，从而产生对角剪切张量。随后，对密度微扰演化方程进行了研究，并对结果进行了解释。我们还指出了这些结果在广义相对论的情况下是如何变化的，并简要地提到了高阶引力理论的预期变化。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Advances in High Energy Physics PHYSICS, PARTICLES & FIELDS-

CiteScore

3.40

自引率

5.90%

发文量

审稿时长

6-12 weeks

期刊介绍： Advances in High Energy Physics publishes the results of theoretical and experimental research on the nature of, and interaction between, energy and matter. Considering both original research and focussed review articles, the journal welcomes submissions from small research groups and large consortia alike.

Density Perturbation and Cosmological Evolution in the Presence of Magnetic Field in f R

Abstract

Density Perturbation and Cosmological Evolution in the Presence of Magnetic Field in $f (R)$