修正引力中的宇宙奇点和幂律解

IF 3 3区物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY

Annals of Physics Pub Date : 2024-11-01 DOI:10.1016/j.aop.2024.169829

Saurya Das , S. Shajidul Haque , Seturumane Tema

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引用次数: 0

摘要

反弹的宇宙避免了大爆炸奇点。利用类时间方程和空雷乔杜里方程，我们探讨了在广泛的修正引力理论中，大爆炸附近的反弹是否允许在合理的物理条件下产生与宇宙相关的幂律解。我们的研究表明，某些修正引力理论，如斯特勒引力，在任何合理条件下都不能显示出奇点解析，而包括 f(R) 引力和布兰斯-迪克理论在内的其他理论则可以在适当条件下显示出奇点解析。对于这些理论，我们证明了加速解略微优于空心解。

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Cosmological singularity and power-law solutions in modified gravity

A bouncing Universe avoids the big-bang singularity. Using the time-like and null Raychaudhuri equations, we explore whether the bounce near the big-bang, within a broad spectrum of modified theories of gravity, allows for cosmologically relevant power-law solutions under reasonable physical conditions. Our study shows that certain modified theories of gravity, such as Stelle gravity, do not demonstrate singularity resolution under any reasonable conditions, while others including

f (R)

gravity and Brans–Dicke theory can demonstrate singularity resolution under suitable conditions. For these theories, we show that the accelerating solution is slightly favored over ekypyrosis.

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来源期刊

Annals of Physics 物理-物理：综合

CiteScore

5.30

自引率

3.30%

发文量

211

审稿时长

47 days

期刊介绍： Annals of Physics presents original work in all areas of basic theoretic physics research. Ideas are developed and fully explored, and thorough treatment is given to first principles and ultimate applications. Annals of Physics emphasizes clarity and intelligibility in the articles it publishes, thus making them as accessible as possible. Readers familiar with recent developments in the field are provided with sufficient detail and background to follow the arguments and understand their significance. The Editors of the journal cover all fields of theoretical physics. Articles published in the journal are typically longer than 20 pages.