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arXiv · 1602.03721

The $Λ_2$ limit of massive gravity

Claudia de Rham·Andrew J. Tolley·Shuang-Yong Zhou
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Abstract

Lorentz-invariant massive gravity is usually associated with a strong coupling scale $Λ_3$. By including non-trivial effects from the Stueckelberg modes, we show that about these vacua, one can push the strong coupling scale to higher values and evade the linear vDVZ-discontinuity. For generic parameters of the theory and generic vacua for the Stueckelberg fields, the $Λ_2$-decoupling limit of the theory is well-behaved and free of any ghost or gradient-like instabilities. We also discuss the implications for nonlinear sigma models with Lorentzian target spaces.

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Claudia de Rham, Andrew J. Tolley, Shuang-Yong Zhou. 2016-05-09. The $Λ_2$ limit of massive gravity. https://doi.org/10.1007/jhep04(2016)188

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