Evolutionary phases of the accelerating universe in modified gravity and its solar system test

IF 1.1 4区 物理与天体物理 Q3 PHYSICS, MULTIDISCIPLINARY
Tame Achi, H. S. Singh
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引用次数: 0

Abstract

Einstein’s gravity is modified to explain an accelerating universe’s present and past scenarios by numerically exploring different cosmological parameters. A new f(R) gravity model constrained with coupling constants is introduced in the Einstein-Hilbert action to explain current issues and open up new possibilities in gravity physics by fitting the model with newly collected data from observations. It is proposed that the current universe is undergoing an accelerating expansion which behaves as Chaplygin Gas-type dark energy. The values of the coupling constants involved in f(R) gravity are chosen so that the current value of the effective equation of state (ωeff0) is shown within the observational approximation, that is, between −0.8 and −1.0. Cosmological parameters such as deceleration, cosmic jerk, and snap are consistent with the fundamental observational constraint, and their relevance in terms of coupling constant is also emphasized. The viability of the model as well as the existence and origin of scalaron mass are also investigated.
修正重力下加速宇宙的演化阶段及其太阳系测试
爱因斯坦的万有引力被修正,通过数值探索不同的宇宙学参数来解释一个正在加速的宇宙的现在和过去的情况。在爱因斯坦-希尔伯特作用中引入了一个新的受耦合常数约束的f(R)引力模型,以解释当前的问题,并通过将新收集的观测数据拟合模型,开辟了引力物理学的新可能性。提出当前宇宙正在经历一种加速膨胀,其表现为Chaplygin气体型暗能量。选择f(R)引力所涉及的耦合常数的值,使有效状态方程的电流值(ωeff0)显示在观测近似范围内,即在−0.8和−1.0之间。宇宙学参数如减速、宇宙猛跳和瞬间等符合基本观测约束,并强调了它们在耦合常数方面的相关性。本文还对模型的可行性以及标量质量的存在和起源进行了研究。
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
Canadian Journal of Physics
Canadian Journal of Physics 物理-物理:综合
CiteScore
2.30
自引率
8.30%
发文量
65
审稿时长
1.7 months
期刊介绍: The Canadian Journal of Physics publishes research articles, rapid communications, and review articles that report significant advances in research in physics, including atomic and molecular physics; condensed matter; elementary particles and fields; nuclear physics; gases, fluid dynamics, and plasmas; electromagnetism and optics; mathematical physics; interdisciplinary, classical, and applied physics; relativity and cosmology; physics education research; statistical mechanics and thermodynamics; quantum physics and quantum computing; gravitation and string theory; biophysics; aeronomy and space physics; and astrophysics.
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