Extending applicability of bimetric theory: chameleon bigravity
Extending applicability of bimetric theory: chameleon bigravity
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DOI：
10.1007/s10714-018-2342-z
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发表时间：
2017-02
影响因子：
2.8
通讯作者：
Antonio De Felice;S. Mukohyama;J. Uzan
中科院分区：
文献类型：
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作者：
Antonio De Felice;S. Mukohyama;J. Uzan
本文扩展了质量引力的对称公式，使引力子的质量依赖于它的环境。这种最小的扩展提供了一种新的方法来调和大质量引力与广义相对论的局部测试，而不需要调用Vainshtein机制。在宇宙学尺度上，认为该模型是稳定的，并且它绕过了Higuchi界，从而放宽了对参数空间的约束。此外，随着这种扩展，强耦合尺度也以这样一种方式保持足够高的膨胀率，一直到非常早期的宇宙，而目前的引力子质量足够低，在现象学上很有趣。从这个意义上说，扩展的引力理论是标准引力理论的部分UV补全。这个扩展是非常通用和健壮的，并描述了一个简单的具体示例。
This article extends bimetric formulations of massive gravity to make the mass of the graviton to depend on its environment. This minimal extension offers a novel way to reconcile massive gravity with local tests of general relativity without invoking the Vainshtein mechanism. On cosmological scales, it is argued that the model is stable and that it circumvents the Higuchi bound, hence relaxing the constraints on the parameter space. Moreover, with this extension the strong coupling scale is also environmentally dependent in such a way that it is kept sufficiently higher than the expansion rate all the way up to the very early universe, while the present graviton mass is low enough to be phenomenologically interesting. In this sense the extended bigravity theory serves as a partial UV completion of the standard bigravity theory. This extension is very generic and robust and a simple specific example is described.