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Scalar stochastic gravitational-wave background in Brans-Dicke theory of gravity

Du, Song Ming (2019) Scalar stochastic gravitational-wave background in Brans-Dicke theory of gravity. Physical Review D, 99 (4). Art. No. 044057. ISSN 2470-0010. http://resolver.caltech.edu/CaltechAUTHORS:20190228-085142034

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Abstract

We study the scalar stochastic gravitational-wave background (SGWB) from astrophysical sources, including compact binary mergers and stellar collapses, in the Brans-Dicke theory of gravity. By contrast to tensor waves, the scalar SGWB predominantly arises from stellar collapses. These collapses not only take place at higher astrophysical rates but also emit more energy. This is because, unlike tensor radiation which mainly starts from quadrupole order, the scalar perturbation can be excited by changes in the monopole moment. In particular, in the case of stellar collapse into a neutron star or a black hole, the monopole radiation, at frequencies below 100 Hz, is dominated by the memory effect. At low frequencies, the scalar SGWB spectrum follows a power law of Ω_S ∝ f^α, with α = 1. We predict that Ω_S is inversely proportional to the square of ω_(BD) + 2, with (ω_(BD) + 2)^2Ω_S (f = 25 Hz) = 2.8 × 10^(−6). We also estimate the detectability of the scalar SGWB for current and third-generation detector networks and the bound on ω_(BD) that can be imposed from these observations.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1103/physrevd.99.044057DOIArticle
https://arxiv.org/abs/1812.06068arXivDiscussion Paper
Additional Information:© 2019 American Physical Society. (Received 14 December 2018; published 28 February 2019) The author would like to thank Yanbei Chen for valuable discussions and comments on the manuscript. The author is also grateful to Xi-Long Fan, Xiang-Cheng Ma, and Atsushi Nishizawa for discussions. The author acknowledges support from the Brinson Foundation and the Simons Foundation. This research has also been supported by the National Science Foundation, through Grants No. PHY-1404569, No. PHY-1708212, and No. PHY-1708213.
Group:TAPIR, Walter Burke Institute for Theoretical Physics
Funders:
Funding AgencyGrant Number
Brinson FoundationUNSPECIFIED
Simons FoundationUNSPECIFIED
NSFPHY-1404569
NSFPHY-1708212
NSFPHY-1708213
Record Number:CaltechAUTHORS:20190228-085142034
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20190228-085142034
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:93327
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:28 Feb 2019 18:51
Last Modified:28 Feb 2019 18:51

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