Constraints on Einstein-aether theory after GW170817

Abstract

In this paper, we carry out a systematic analysis of the theoretical and observational constraints on the dimensionless coupling constants $c_i$ ($i=1,2,3,4$) of the Einstein-aether theory, taking into account the events GW170817 and GRB 170817A. The combination of these events restricts the deviation of the speed $c_T$ of the spin-2 graviton to the range, $-3\times 10^{-15}<c_T-1<7\times 10^{-16}$, which for the Einstein-aether theory implies $\left|c_{13}\right|\le 10^{-15}$ with $c_{ij}\equiv c_i+c_j$. The rest of the constraints are divided into two groups: those on the ($c_1,c_{14}$)-plane and those on the ($c_2,c_{14}$)-plane, except the strong-field constraints. The latter depend on the sensitivities ${\sigma }_{\text{ae}}$ of neutron stars, which are not known at present in the new ranges of the parameters found in this paper.

Comments: revtex4, one figure and no table. Discussions of the relations with the khronometric theory were added. Phys. Rev. D97, 124023 (2018)