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arXiv · 1802.04303

Constraints on Einstein-aether theory after GW170817

Jacob Oost·Shinji Mukohyama·Anzhong Wang
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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 $\sigma_{\ae}$ of neutron stars, which are not known at present in the new ranges of the parameters found in this paper.

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Jacob Oost, Shinji Mukohyama, Anzhong Wang. 2018-02-12. Constraints on Einstein-aether theory after GW170817. https://doi.org/10.1103/physrevd.97.124023

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