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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.
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Enrico Barausse, Kent Yagi. Gravitation-Wave Emission in Shift-Symmetric Horndeski Theories. Physical Review Letters, 2015, 115, ⟨10.1103/PhysRevLett.115.211105⟩. ⟨insu-03644691⟩



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