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;
2015-01-01
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.| File | Dimensione | Formato | |
|---|---|---|---|
|
Gravitational_wave.pdf
accesso aperto
Tipologia:
Documento in Post-print
Licenza:
Non specificato
Dimensione
145.94 kB
Formato
Adobe PDF
|
145.94 kB | Adobe PDF | Visualizza/Apri |
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
