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arXiv 2201.00502gr-qchep-th
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非最小耦合$f(R,T)$引力的能量条件

Energy Conditions in Non-minimally Coupled $f(R,T)$ Gravity

P. K. Sahoo, Sanjay Mandal, Simran Arora

摘要:

在今天的情况下,超越爱因斯坦的引力理论,我们会得到一些更完整和修改的引力理论。其中之一是$f(R,T)$引力,其中$ R $是里奇标量,$ T $是能量动量张量的迹。利用一个单参数线性$f(R,T)$引力模型,在最简单的非最小物质几何与理想流体分布耦合下,研究了强能量条件(SEC)、弱能量条件(WEC)、零能量条件(NEC)和主能量条件(DEC).模型参数受到能量条件和单参数状态方程的约束,从而使$f(R,T)$模型与宇宙加速膨胀相容。可以看出,EoS参数说明了在一个占主导地位的加速阶段的精华阶段,精确到宇宙学常数的预测幻影时代。此外,宇宙学常数和宇宙加速度的当前值被用来检查我们的线性引力$f(R,T)$模型的可行性。结果表明,DEC和WEC的正行为表明模型的有效性。相反,SEC违反了导致宇宙加速膨胀的条件。

英文摘要:

In today's scenario, going beyond Einstein's theory of gravity leads us to some more complete and modified gravity theories. One of them is the $f(R,T)$ gravity in which $ R $ is the Ricci scalar, and $ T $ is the trace of the energy-momentum tensor. Using a well-motivated linear $f(R,T)$ gravity model with a single parameter, we studied the strong energy condition (SEC), the weak energy condition (WEC), the null energy condition (NEC), and the dominant energy condition (DEC) under the simplest non-minimal matter geometry coupling with a perfect fluid distribution. The model parameter is constrained by energy conditions and a single parameter proposed equation of state (EoS), resulting in the compatibility of the $f(R,T)$ models with the accelerated expansion of the universe. It is seen that the EoS parameter illustrate the quintessence phase in a dominated accelerated phase, pinpoint to the cosmological constant yields as a prediction the phantom era. Also, the present values of the cosmological constant and the acceleration of the universe are used to check the viability of our linear $f(R,T)$ model of gravity. It is observed that the positive behavior of DEC and WEC indicates the validation of the model. In contrast, SEC is violating the condition resulting in the accelerated expansion of the universe.

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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