arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2003.06403gr-qc
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关于推广的$f(P)$立方引力的动力学特征的注记

A note on the dynamical features for the extended $f(P)$ cubic gravity

Mihai Marciu

摘要:

本文从动力系统分析的传递性角度,考虑幂律$f(P)=f_0 P^α$和指数型$f(P)=f_0 e^{αP}$两种特殊情况下的线性稳定性理论,研究了扩展的$f(P)$立方引力模型的物理特性,其中$f_0$和$α$为常参数.在这些情况下,我们分析了相空间复杂性的影响,揭示了宇宙学的解决方案,重视临界点。对于幂律和指数引力类型,我们注意到存在两个与临界点相关的宇宙学纪元,对应于德西特纪元和类五世纪元,由常数有效状态方程描述。对于所有这些解决方案,我们已经研究了与稳定性相关的动态特性,从瞬态的角度确定可能的各种参数的约束。动力学前景断言,扩展的$f(P)$立方引力可以代表一个有前途的引力修正理论,导致在后期时间演化的加速膨胀的表现。

英文摘要:

The paper studies the physical characteristics for the extended $f(P)$ cubic gravity from a transitive perspective based on dynamical system analysis, by considering the linear stability theory in two specific cases, corresponding to power-law $f(P)=f_0 P^α$ and exponential $f(P)=f_0 e^{αP}$ gravity types, where $f_0$ and $α$ are constant parameters. In these cases we have analyzed the effects in the phase space complexity, revealing the cosmological solutions attached to the critical points. For the power-law and exponential gravity types, we have noticed the presence of two cosmological epochs associated to the critical points involved, corresponding to de-Sitter eras and quintessence-like epochs, described by a constant effective equation of state. For all of these solutions we have studied the dynamical characteristics which are associated to the stability properties, determining possible constraints to various parameters from a transient perspective. The dynamical prospects asserted that the extended $f(P)$ cubic gravity can represent a promising modified theory of gravitation, leading to the manifestation of the accelerated expansion at late time evolution.

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