3 years ago

Gravitational wave speed: Implications for models without a mass scale.

Nelson A. Lima, Luca Amendola, Henrik Nersisyan

The recent report that the gravitational wave speed equals the light speed puts strong constraints on the anisotropic stress parameter of many modified gravity models, a quantity that is directly observable through large-scale structure. We show here that models without a mass scale completely escape these constraints. We discuss a few relevant cases in detail: Brans-Dicke theory, nonlocal models, and Galileon Lagrangian.

Publisher URL: http://arxiv.org/abs/1801.06683

DOI: arXiv:1801.06683v1

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