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arXiv 2207.07652gr-qchep-th
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广义相对论流体力学的广义引力宇宙学模型

Bouncing cosmological model with general relativistic hydrodynamics in extended gravity

A. Y. Shaikh, Sankarsan Tarai, S. K. Tripathy, B. Mishra

摘要:

本文在广义相对论流体力学(GRH)存在的条件下,在一个推广的引力理论中,给出了各向同性、均匀时空背景下的弹跳宇宙模型。选择比例因子的方式是,通过适当的归一化,可以评估五分之一跳频场景。因此,在$t=0$处发生反弹,并且相应的哈勃参数在反弹时期消失。分析了该模型的状态方程参数和能量条件。强能量条件的破坏进一步支持了广义引力的行为。由于弹跳宇宙学具有不稳定性,该模型也表现出类似的行为。

英文摘要:

In this paper, in an extended theory of gravity, we have presented bouncing cosmological model at the backdrop of an isotropic, homogeneous space-time, in presence of general relativistic hydrodynamics (GRH). The scale factor has been chosen in such a manner that with appropriate normalization, the quintom bouncing scenario can be assessed. Accordingly, the bounce occurs at $t=0$ and the corresponding Hubble parameter vanishes at the bounce epoch. The equation of state (EoS) parameter and the energy conditions of the model have been analysed. The violation of strong energy condition further supports the behaviour of extended gravity. As the bouncing cosmology suffers with instability, this model also shows the similar behaviour.

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