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arXiv 1806.09275gr-qc
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高阶导数$f(R,\Box R,T)$引力的能量条件

Energy Conditions in Higher Derivative $f(R,\Box R,T)$ Gravity

Z. Yousaf, M. Sharif, M. Ilyas, M. Z. Bhatti

摘要:

本文通过分析能量条件(其中$R$和$T$分别是Ricci标量和能量动量张量的迹),研究了高阶导数$f(R,\Box R, T)$理论的生存界.我们取平坦的弗里德曼-勒梅特-罗伯逊-沃克时空与物质含量的理想组态耦合。我们考虑三种不同的现实模型,这种引力,可以用来理解宇宙学解决方案的稳定性。在构建了由能量条件,更具体地说是弱能量条件介导的某些边界之后,我们讨论了在最近估计的宇宙参数的数值选择的环境中,所考虑的修改模型的可行区域。

英文摘要:

In this paper, we examined the viability bounds of a higher derivative $f(R,\Box R, T)$ theory through analyzing energy conditions (where $R$ and $T$ are the Ricci scalar and trace of energy momentum tensor, respectively). We take flat Friedmann-Lemaître-Robertson-Walker spacetime coupled with ideal configurations of matter content. We consider three different realistic models of this gravity, that could be utilized to understand the stability of cosmological solutions. After constructing certain bounds mediated by energy conditions, more specifically weak energy condition, we discuss viable zones of the under considered modified models in an environment of recent estimated numerical choices of the cosmic parameters.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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