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...

Full description

Saved in:
Bibliographic Details
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
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.115.211105