Full linear perturbations and localization of gravity on f(R, T) brane

Full linear perturbations and localization of gravity on f(R, T) brane
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f(R, T) 膜上的全线性扰动和重力本地化

DOI:
10.1140/epjc/s10052-017-4666-3
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发表时间:
2016-06
影响因子:
4.4
通讯作者:
Liu Yu-Xiao
Liu Yu-Xiao
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Gu Bao-Min;Zhang Yu-Peng;Yu Hao;Liu Yu-Xiao

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我们研究了最近提出的f(R, T)引力理论中构造的厚膜世界系统,其中R为里奇标量,T为能量动量张量的迹。我们试图得到解析背景解,并讨论了全线性摄动,特别是标量摄动。我们比较了膜世界模型与耦合正则标量场的广义相对论模型的修正。发现一些更有趣的背景解是允许的,只有标量摄动模式被修改。该模型中不存在速子态,只有无质量张量模可以局域在膜上,从而恢复了有效的四维引力。这些结论是成立的,前提是动作的原始形式主义的两个约束条件得到满足。
We study the thick brane world system constructed in the recently proposed f(R, T) theories of gravity, with R the Ricci scalar and T the trace of the energy-momentum tensor. We try to get the analytic background solutions and discuss the full linear perturbations, especially the scalar perturbations. We compare how the brane world model is modified with that of general relativity coupled to a canonical scalar field. It is found that some more interesting background solutions are allowed, and only the scalar perturbation mode is modified. There is no tachyon state existing in this model and only the massless tensor mode can be localized on the brane, which recovers the effective four-dimensional gravity. These conclusions hold provided that two constraints on the original formalism of the action are satisfied.
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