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arXiv 0810.2554gr-qc
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度规f(R)引力理论的稳定性蕴含牛顿极限

Stability of a metric f(R) gravity theory implies the Newtonian limit

Leszek M. Sokolowski

摘要:

我们证明了牛顿极限的存在不能作为从所有L=f(R)引力理论中选择正确引力理论的选择规则。为此,我们证明了在任意纯度量f(R)引力中基态解的稳定性意味着理论的牛顿极限的存在。稳定性被认为是任何引力理论的基本可行性准则。如果基态是平坦时空,牛顿极限在数学意义上是严格的;如果基态是德西特或AdS空间,牛顿极限在小于宇宙学尺度的长度尺度上是近似的和有效的。因此,关于牛顿极限,度规f(R)引力与具有任意λ的GR没有区别。这是一个特殊的拉格朗日只依赖于R和/或里奇张量。一个独立的选择规则是必要的。

英文摘要:

We show that the existence of the Newtonian limit cannot work as a selection rule for choosing the correct gravity theory fromm the set of all L=f(R) ones. To this end we prove that stability of the ground state solution in arbitrary purely metric f(R) gravity implies the existence of the Newtonian limit of the theory. And the stability is assumed to be the fundamental viability criterion of any gravity theory. The Newtonian limit is either strict in the mathematical sense if the ground state is flat spacetime or approximate and valid on length scales smaller than the cosmological one if the ground state is de Sitter or AdS space. Hence regarding the Newtonian limit a metric f(R) gravity does not differ from GR with arbitrary Lambda. This is exceptional to Lagrangians solely depending on R and/or Ricci tensor. An independent selection rule is necessary.

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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