Constraints on Einstein-aether theory after GW170817
  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.
