Constraints on Einstein-aether theory after GW170817 [CL]

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 of the spin-2 graviton $c_T$ 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 $c_{13} \equiv c_{1} + c_{3}$. 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, where $c_{14}\equiv c_1+c_4$, except for the strong-field constraints. The strong-field constraints depend on the sensitivities $\sigma_{\ae}$ of neutron stars, which are not known at present in the new ranges of the parameters found in this paper.

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J. Oost, S. Mukohyama and A. Wang
Wed, 14 Feb 18

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