Neutron star sensitivities in Hořava gravity after GW170817

Enrico Barausse
Phys. Rev. D 100, 084053 – Published 24 October 2019; Erratum Phys. Rev. D 104, 069903 (2021)

Abstract

Hořava gravity breaks boost invariance in the gravitational sector by introducing a preferred time foliation. The dynamics of this preferred slicing is governed, in the low-energy limit suitable for most astrophysical applications, by three dimensionless parameters α, β and λ. The first two of these parameters are tightly bound by Solar System and gravitational-wave propagation experiments, but λ remains relatively unconstrained (0λ0.010.1). We restrict here to the parameter-space region defined by α=β=0 (with λ kept generic), which in a previous paper we showed to be the only one where black hole solutions are nonpathological at the universal horizon, and we focus on possible violations of the strong equivalence principle in systems involving neutron stars. We compute neutron star “sensitivities,” which parametrize violations of the strong equivalence principle at the leading post-Newtonian order, and find that they vanish identically, like in the black hole case, for α=β=0 and generic λ0. This implies that no violations of the strong equivalence principle (neither in the conservative sector nor in gravitational-wave fluxes) can occur at the leading post-Newtonian order in binaries of compact objects, and that data from binary pulsars and gravitational interferometers are unlikely to further constrain λ.

  • Received 16 July 2019

DOI:https://doi.org/10.1103/PhysRevD.100.084053

© 2019 American Physical Society

Physics Subject Headings (PhySH)

Gravitation, Cosmology & Astrophysics

Erratum

Authors & Affiliations

Enrico Barausse

  • SISSA, Via Bonomea 265, 34136 Trieste, Italy and INFN Sezione di Trieste; IFPU—Institute for Fundamental Physics of the Universe, Via Beirut 2, 34014 Trieste, Italy, and Institut d’Astrophysique de Paris, CNRS & Sorbonne Universités, UMR 7095, 98 bis bd Arago, 75014 Paris, France

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Issue

Vol. 100, Iss. 8 — 15 October 2019

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