Cosmological aspects of anisotropic chameleonic Brans-Dicke gravity

被引：8

作者：

Singh, Ashutosh ^{[1
]}

Pradhan, Anirudh ^{[1
]}

Beesham, Aroonkumar ^{[2
,3
,4
]}

机构：

[1] GLA Univ, Ctr Cosmol Astrophys & Space Sci, Mathura 281406, India

[2] Univ Zululand, Dept Math Sci, ZA-3886 Kwa Dlangezwa, South Africa

[3] Natl Inst Theoret & Computat Sci, Stellenbosch, South Africa

[4] Mangosuthu Univ Technol, Fac Nat Sci, Durban, South Africa

来源：

NEW ASTRONOMY | 2023年 / 100卷

关键词：

Brans-Dicke gravity; LRS; Acceleration; Chameleon; HOLOGRAPHIC DARK ENERGY; MODELS;

D O I：

10.1016/j.newast.2022.101995

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We study the cosmological implications of non-minimal coupling of a scalar field with matter sector in the Brans-Dicke gravity. In particular, in the context of locally rotationally symmetric Bianchi-I (LRS BI) metric, we derived the field equations and used these equations to find a relation between scale factor and scalar field. We use this relation to find two different solutions, namely an eternally accelerating universe and a transit universe. By the power-law solutions for scalar field and coupling function, we find the allowed range of exponents for an accelerating universe. We further explore the direction and magnitude of energy transfer between scalar field and matter sector. We show by using the second law of thermodynamics that the direction and magnitude of energy transfer are closely related to the behavior of coupling function. In the transit universe, we investigate the dependence of the effective equation of state parameter and the effective energy density on the anisotropy parameter. The model explains the late-time accelerating universe evolution.

引用

页数：6

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