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arXiv 0906.1190gr-qc
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关于$f(R)$理论的de Sitter嵌入的注记

A Note on de Sitter Embedding of $f(R)$ Theories

Israel Quiros, Yoelsy Leyva, Yunelsy Napoles

摘要:

德西特嵌入的$f(R)$理论施加的拉格朗日的参数的约束的后果,在度量形式主义进行了研究。它示出,特别是,几个常见的$f(R)$拉格朗日实际上不承认这样的嵌入。否则,与背景(最大对称)常曲率空间的相应模型的局部解的渐近匹配要么是不稳定的,要么反德西特嵌入是唯一稳定的嵌入。额外的参数给出了赞成以前的主张,一类$f(R)$模型,包括正和负功率的$R$(两个不同的质量尺度),可能是一个很好的方案,在一个统一的图片,既早期的通货膨胀和后期的加速膨胀的宇宙。这里所采用的方法,也被用来检查鬼自由的狄拉克-玻恩-因菲尔德修改的广义相对论以前研究的书目。

英文摘要:

The consequences of the constraints which de Sitter embedding of $f(R)$ theories imposes on the Lagrangian's parameters, are investigated within the metric formalism. It is shown, in particular, that several common $f(R)$ Lagrangians do not actually admit such an embedding. Otherwise, asymptotic matching of local solutions of the corresponding models with background (maximally symmetric) spaces of constant curvature is either unstable or, anti-de Sitter embedding is the only stable embedding. Additional arguments are given in favour of a previous claim that a class of $f(R)$ models comprising both positive and negative powers of $R$ (two different mass scales), could be a nice scenario where to address, in a united picture, both early-time inflation and late-time accelerated expansion of the universe. The approach undertaken here is used, also, to check ghost-freedom of a Dirac-Born-Infeld modification of general relativity previously studied in the bibliography.

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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