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arXiv 1003.5152hep-thastro-ph.COgr-qchep-ph
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$f(R)$理论与Horava-Lifshitz引力暗区的几何起源

$f(R)$ theory and geometric origin of the dark sector in Horava-Lifshitz gravity

Anzhong Wang

摘要:

研究了在没有细致平衡条件但具有可投射性的Horava-Lifshitz量子引力作用量中包含$f(R)$项的问题,其中$R$表示三维Ricci标量.研究了自旋为0的引力子不存在鬼点和不稳定性的条件。在IR中,理论归结为广义相对论的要求使得标量模在Minkowski背景下是不稳定的,而在de Sitter背景下是稳定的。值得注意的是,宇宙的暗区,即暗物质和暗能量,在这样的一个设置中有一个自然的几何起源。跳跃的宇宙也可以被构建。研究了曲率非零的FRW背景中的标量扰动。

英文摘要:

Inclusion of $f(R)$ term in the action of Horava-Lifshitz quantum gravity with projectability but without detailed balance condition is investigated, where $R$ denotes the 3-spatial dimensional Ricci scalar. Conditions for the spin-0 graviton to be free of ghosts and instability are studied. The requirement that the theory reduce to general relativity in the IR makes the scalar mode unstable in the Minkowski background but stable in the de Sitter. It is remarkable that the dark sector, dark matter and dark energy, of the universe has a naturally geometric origin in such a setup. Bouncing universes can also be constructed. Scalar perturbations in the FRW backgrounds with non-zero curvature are presented.

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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