Improved positivity bounds and massive gravity
Improved positivity bounds and massive gravity
复制标题
改善积极界限和巨大的重力
DOI：
10.1007/jhep04(2018)083
复制
发表时间：
2017
影响因子：
5.4
通讯作者：
A. Tolley
中科院分区：
文献类型：
--
作者：
C. Rham;S. Melville;A. Tolley
大质量伽利略理论和大引力理论可以满足目前已知的改进的正性界限，只要它们是弱耦合的。我们讨论了与质量伽利略密切平行的质量引力的弱耦合UV完成的EFT拉格朗日的形式，并对散射幅度和正界进行了修正的幂计算。Vainshtein机制是大质量引力现象可行性的核心，它与弱耦合是完全一致的，因为它本质上是经典的。我们强调改进的正性约束的唯一含义是EFT截止低于先前的假设，并讨论了可观察到的影响，强调这些界限不能与文献中先前的陈述相反地排除该模型。
A bstractTheories such as massive Galileons and massive gravity can satisfy the presently known improved positivity bounds provided they are weakly coupled. We discuss the form of the EFT Lagrangian for a weakly coupled UV completion of massive gravity which closely parallels the massive Galileon, and perform the power counting of corrections to the scattering amplitude and the positivity bounds. The Vainshtein mechanism which is central to the phenomenological viability of massive gravity is entirely consistent with weak coupling since it is classical in nature. We highlight that the only implication of the improved positivity constraints is that the EFT cutoff is lower than previous assumed, and discuss the observable implications, emphasizing that these bounds are not capable of ruling out the model contrary to previous statements in the literature.