arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0708.0469hep-thastro-phgr-qc
收藏

具有诱导引力、任意物质含量和体中Gauss-Bonnet项的修正膜宇宙学

Modified brane cosmologies with induced gravity, arbitrary matter content and a Gauss-Bonnet term in the bulk

Pantelis S. Apostolopoulos, Nikolaos Brouzakis, Nikolaos Tetradis, Eleftheria Tzavara

摘要:

我们扩展膜宇宙学演化的协变分析,以考虑到,除了一般的物质含量和诱导引力项的膜,高斯-邦纳项的散装。大体积物质对膜演化的引力效应可以用大体积观测者在膜位置测量的总质量来描述。这个质量出现在有效弗里德曼方程中,通过一个被表征为广义暗辐射的项,在演化中引起海市蜃楼效应。我们讨论了组合系统的正常和自加速分支。我们还推导出Raychaudhuri方程,可以用来确定宇宙演化是否在加速。

英文摘要:

We extend the covariant analysis of the brane cosmological evolution in order to take into account, apart from a general matter content and an induced-gravity term on the brane, a Gauss-Bonnet term in the bulk. The gravitational effect of the bulk matter on the brane evolution can be described in terms of the total bulk mass as measured by a bulk observer at the location of the brane. This mass appears in the effective Friedmann equation through a term characterized as generalized dark radiation that induces mirage effects in the evolution. We discuss the normal and self-accelerating branches of the combined system. We also derive the Raychaudhuri equation that can be used in order to determine if the cosmological evolution is accelerating.

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。

↑