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arXiv · 1509.04539

Gravitational-wave emission in shift-symmetric Horndeski theories

Enrico Barausse·Kent Yagi
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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.

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Enrico Barausse, Kent Yagi. 2015-09-15. Gravitational-wave emission in shift-symmetric Horndeski theories. https://doi.org/10.1103/physrevlett.115.211105

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