Gravitation-Wave Emission in Shift-Symmetric Horndeski Theories

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...

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Published in:Physical review letters 2015-11, Vol.115 (21), p.211105-211105, Article 211105
Main Authors: Barausse, Enrico, Yagi, Kent
Format: Article
Language:English
Subjects:
Binary stars
Dynamics
Emission
Formalism
Gravitation
Gravitation theory
Mathematical analysis
Relativity
Sciences of the Universe
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Yagi, Kent
description 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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source American Physical Society:Jisc Collections:APS Read and Publish 2023-2025 (reading list)
subjects Binary stars
Dynamics
Emission
Formalism
Gravitation
Gravitation theory
Mathematical analysis
Relativity
Sciences of the Universe
title Gravitation-Wave Emission in Shift-Symmetric Horndeski Theories
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