arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1005.2600gr-qchep-ph
收藏

宇宙学上可行的高斯-邦纳不变量引力二次修正的真空结构

Vacuum Structure of Cosmologically Viable Quadratic Modifications of Gravity that are Functions of the Gauss-Bonnet Invariant

Israel Quiros, Eduardo Teste

摘要:

我们进行了彻底的研究,最近提出的,可行的,二次修改的重力是高斯-邦纳不变量的函数的理论一致性,关于他们周围的真空,最大对称空间的常曲率扰动的稳定性。我们特别注意,特别是与传播自旋0快子模式的发生,并与引力子鬼的发展病理不稳定性的调查。后一种效应与已知的“里奇稳定性”问题有关,在$f(R)$理论中得到了很好的研究。在二次修改的重力,这是第一次讨论。特别注意到有效引力耦合的非负性要求,这保证了引力子不是负范数态。它表明,一些理论,通过宇宙学以及太阳系的测试,必须排除的基础上,这些病理不稳定性的不可避免的字符。

英文摘要:

We perform a thorough study of the theoretical consistency of recently proposed, viable, quadratic modifications of gravity that are functions of the the Gauss-Bonnet invariant, regarding the stability of their perturbations around vacuum, maximally symmetric spaces of constant curvature. We pay special attention, in particular, to the investigation of pathological instabilities associated with the occurrence of propagating spin-0 tachyon modes, and with the development of a graviton ghost. The latter effect is associated with the known "Ricci stability" issue, well studied in $f(R)$-theories. Within quadratic modifications of gravity it is discussed for the first time. Special attention is paid to the requirement of non-negativity of the effective gravitational coupling, which warrants that the graviton is not a negative-norm state. It is demonstrated that, several theories that pass the cosmological as well as the solar system tests, have to be rule out on the basis of the unavoidable character of these pathological instabilities.

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。

↑