Computation of bulk viscous pressure with observational constraints via scalar field in the General relativity and f(Q) gravity

IF 1.9 4区物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS

Astronomy and Computing Pub Date : 2024-10-01 DOI:10.1016/j.ascom.2024.100885

A. Dixit , S. Gupta , A. Pradhan , S. Krishnannair

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引用次数: 0

Abstract

The present article deals with the isotropic cosmological model of

f (Q)

gravity filled with bulk viscous fluid, where

Q

is the non-metricity term and it is responsible for the gravitational interaction. Aside from the tachyon and quintessence scalar fields, the modified Einstein’s field equations have been resolved through the application of the power law form of the expansion. In this model, the Markov chain Monte Carlo (MCMC) analysis method has been utilized to obtained the best-fit value of the model parameter and it confirms that the model satisfies the recent observational data. We have also examined the EoS parameter for bulk viscosity in these cosmological contexts and it has been determined that

ω_{e f f}

will be located in the phantom region. The correspondence between bulk pressure and the reconstructed

ω_{r e c, Q}

in f(Q) gravity has also been addressed. In the presence of holographic Ricci dark energy, the reconstructed

f (Q)

gravity yields a transition from the quintessence era into phantom era.

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通过广义相对论和 f(Q) 引力中的标量场计算具有观测约束条件的体粘性压力

本文讨论的是充满粘性流体的 f(Q) 重力各向同性宇宙学模型，其中 Q 是非度量项，它负责引力相互作用。除速子和五子标量场外，修正的爱因斯坦场方程通过应用幂律形式的展开得到了解决。在该模型中，我们利用马尔科夫链蒙特卡罗（MCMC）分析方法获得了模型参数的最佳拟合值，并证实该模型满足最近的观测数据。我们还研究了这些宇宙学背景下的体积粘度 EoS 参数，确定 ωeff 将位于幻影区域。我们还研究了在 f（Q）引力下体积压力与重建的 ωrec,Q 之间的对应关系。在存在全息里奇暗能量的情况下，重构的f(Q)引力产生了从五元时代到幻影时代的过渡。

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

Astronomy and Computing ASTRONOMY & ASTROPHYSICSCOMPUTER SCIENCE,-COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS

CiteScore

4.10

自引率

8.00%

发文量

期刊介绍： Astronomy and Computing is a peer-reviewed journal that focuses on the broad area between astronomy, computer science and information technology. The journal aims to publish the work of scientists and (software) engineers in all aspects of astronomical computing, including the collection, analysis, reduction, visualisation, preservation and dissemination of data, and the development of astronomical software and simulations. The journal covers applications for academic computer science techniques to astronomy, as well as novel applications of information technologies within astronomy.