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.

Gravitation-Wave Emission in Shift-Symmetric Horndeski Theories / Barausse, E; Yagi, K. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 115:21(2015), pp. 1-6. [10.1103/PhysRevLett.115.211105]

Gravitation-Wave Emission in Shift-Symmetric Horndeski Theories

Barausse E;
2015

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.
115
21
1
6
211105
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.115.211105
https://arxiv.org/abs/1509.04539
Barausse, E; Yagi, K
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.11767/89682
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