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arXiv 1908.06759gr-qchep-th
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由暗能量密度参数$Ω_Λ$约束f(R,T)引力

Constraining f(R,T) Gravity From The Dark Energy Density Parameter $Ω_Λ$

Snehasish Bhattacharjee, P. K. Sahoo

摘要:

$f(R,T)$引力是\cite{9}中引入的一种广泛使用的引力扩展理论,它是$f(R)$引力的直接推广。在这个扩展的引力理论中的作用量结合了里奇标量$R$和能量动量张量$T$的迹的良好动机的函数形式。本手稿的目的是限制最广泛使用的$f(R,T)$引力模型的形式$f(R+2λT)$,以了解其一致性和适用性的宇宙学。我们在这里交流一种新的方法来找到一个下界的模型参数$λ\gtrsim -1.9 \times 10^{-8}$通过方程的宇宙常数($Λ$)和宇宙的临界密度($ρ_{cr}$)。

英文摘要:

$f(R,T)$ gravity is a widely used extended theory of gravity introduced in \cite{9} which is a straightforward generalization of $f(R)$ gravity. The action in this extended theory of gravity incorporates well motivated functional forms of the Ricci scalar $R$ and trace of energy momentum tensor $T$. The present manuscript aims at constraining the most widely used $f(R,T)$ gravity model of the form $f(R+2λT)$ to understand its coherency and applicability in cosmology. We communicate here a novel method to find an lower bound on the model parameter $λ\gtrsim -1.9 \times 10^{-8}$ through the equation relating the cosmological constant ($Λ$) and the critical density of the universe ($ρ_{cr}$).

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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