Observational constraints for an axially symmetric transitioning model with bulk viscosity parameterization

IF 1.9 4区物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS Astronomy and Computing Pub Date : 2023-10-01 DOI:10.1016/j.ascom.2023.100768

A. Dixit , A. Pradhan , V.K. Bhardwaj , A. Beesham

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引用次数: 1

Abstract

In this paper, we have analyzed the significance of bulk viscosity in an axially symmetric Bianchi type-I model to study the accelerated expansion of the universe. We have considered four bulk viscosity parameterizations for the matter-dominated cosmological model. The function of the two significant Hubble $H (z)$ and deceleration parameters are discussed in detail. The energy parameters of the universe are computed using the most recent observational Hubble data (57 data points) in the redshift range $0.07 \leq z \leq 2.36$ . In this model, we obtained all feasible solutions with the viscous component and analyzed the universe’s expansion history. Finally, we analyzed the statefinder diagnostic and found some interesting results. The outcomes of our developed model now properly align with observational results.

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具有体粘度参数化的轴对称过渡模型的观测约束

本文分析了体粘度在轴对称Bianchi i型模型中对研究宇宙加速膨胀的意义。我们考虑了物质占主导的宇宙学模型的四种体粘度参数化。详细讨论了两个重要的哈勃H(z)和减速参数的函数。宇宙的能量参数是使用最新的哈勃观测数据(57个数据点)计算的，红移范围为0.07≤z≤2.36。在该模型中，我们得到了具有粘性分量的所有可行解，并分析了宇宙的膨胀历史。最后，我们分析了状态查找器诊断，发现了一些有趣的结果。我们开发的模型的结果现在与观测结果完全一致。

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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.