Gravitational wave speed: Implications for models without a mass scale

2018/01/20 by Henrik Nersisyan, Nersisyan, Henrik, Nelson A. Lima +3
Physics and Astronomy · #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc) #astro-ph.CO #gr-qc

paper · pdf · doi:10.48550/arxiv.1801.06683

5 pages

arxiv created 2018/01/20 · arxiv updated 2018/01/23

Abstract

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.

Related

• Modified gravity, gravitational waves and the large-scale structure of the Universe: A brief report
• Astrophysical constraints on extended gravity models
• Absolute parallelism, modified gravity, and suppression of gravitational short waves
• Maximal freedom at minimum cost: linear large-scale structure in general modifications of gravity
• Gravitational wave in Lorentz violating gravity