Gravitational-wave emission in shift-symmetric Horndeski theories
General Relativity and Quantum Cosmology
2015-11-25 v2 Cosmology and Nongalactic Astrophysics
High Energy Physics - Theory
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 reproducing the binary-pulsar observed orbital decay.
Keywords
Cite
@article{arxiv.1509.04539,
title = {Gravitational-wave emission in shift-symmetric Horndeski theories},
author = {Enrico Barausse and Kent Yagi},
journal= {arXiv preprint arXiv:1509.04539},
year = {2015}
}
Comments
6 pages. Minor changes to match version accepted for publication in PRL