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arXiv 1406.0577gr-qchep-th
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$N$ -维$f(R)$引力中的Misner-Sharp质量

Misner-Sharp Mass in $N$-dimensional $f(R)$ Gravity

Hongsheng Zhang, Yapeng Hu, Xin-Zhou Li

摘要:

本文研究了$n$维(n $\geq$ 3)时空中的$f(R)$引力的Misner-Sharp质量,该时空允许三种类型的$(n-2)$维极大对称子空间.我们通过两种方法获得Misner-Sharp质量。一种是逆统一第一定律方法,另一种是使用广义Kodama矢量的守恒电荷方法。在第一种方法中,我们假设统一第一仍然在$n$维$f(R)$引力中成立,这需要一个准局域质量形式(我们定义它为广义Misner-Sharp质量)。在第二种方法中,对应于广义局域Kodama矢量的守恒电荷是广义Misner-Sharp质量。这两种方法是等价的,它们通过一个约束连接在一起。这个约束决定了一个定义明确的Misner-Sharp质量的存在。作为一个重要的特例,我们给出了静态空间的显式形式,并以Clifton-Barrow解为例计算了Misner-Sharp质量.

英文摘要:

We study the Misner-Sharp mass for the $f(R)$ gravity in an $n$-dimensional (n$\geq$3) spacetime which permits three-type $(n-2)$-dimensional maximally symmetric subspace. We obtain the Misner-Sharp mass via two approaches. One is the inverse unified first law method, and the other is the conserved charge method by using a generalized Kodama vector. In the first approach, we assume the unified first still holds in the $n$-dimensional $f(R)$ gravity, which requires a quasi-local mass form (We define it as the generalized Misner-Sharp mass). In the second approach, the conserved charge corresponding to the generalized local Kodama vector is the generalized Misner-Sharp mass. The two approaches are equivalent, which are bridged by a constraint. This constraint determines the existence of a well-defined Misner-Sharp mass. As an important special case, we present the explicit form for the static space, and we calculate the Misner-Sharp mass for Clifton-Barrow solution as an example.

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