title: Gravitation-Wave Emission in Shift-Symmetric Horndeski Theories.
abstract: Gravity theories beyond general relativity typically predict dipolar gravitational emission by compact-star binaries. This emission is sourced by "sensitivity" parameters depending on the stellar compactness. We introduce a general formalism to calculate these parameters, and show that in shift-symmetric Horndeski theories stellar sensitivities and dipolar radiation vanish, provided that the binary's dynamics is perturbative (i.e., the post-Newtonian formalism is applicable) and cosmological-expansion effects can be neglected. This allows one to reproduce the binary-pulsar-observed orbital decay.
authors.affiliation: Sorbonne Universités, UPMC Université Paris 6 and CNRS, UMR 7095, Institut d'Astrophysique de Paris, 98 bis boulevard Arago, 75014 Paris, France.
authors.forename: Enrico
authors.initials: E
authors.lastname: Barausse
authors.affiliation: Department of Physics, Princeton University, Princeton, New Jersey 08544, USA.|Department of Physics, Montana State University, Bozeman, Montana 59717, USA.
authors.forename: Kent
authors.initials: K
authors.lastname: Yagi