Gravitational-wave emission in shift-symmetric Horndeski theories
arXiv:1509.04539 · doi:10.1103/PhysRevLett.115.211105
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.
6 pages. Minor changes to match version accepted for publication in PRL
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