Power radiated by a binary system in a de Sitter universe

Béatrice Bonga and Jeffrey S. Hazboun
Phys. Rev. D 96, 064018 – Published 13 September 2017

Abstract

Gravitational waves emitted by high redshift sources propagate through various epochs of the Universe including the current era of measurable, accelerated expansion. Historically, the calculation of gravitational wave power on cosmological backgrounds is based on various simplifications, including a 1/r-expansion and the use of an algebraic projection to retrieve the radiative degrees of freedom. On a de Sitter spacetime, recent work has demonstrated that many of these calculational techniques and approximations do not apply. Here we calculate the power emitted by a binary system on a de Sitter background using techniques tailored to de Sitter spacetime. The common expression for the power radiated by this source in an Friedmann-Lemaître-Robertson-Walker spacetime, calculated using far wave-zone techniques, gives the same expression as the late time expansion specialized to the de Sitter background in the high-frequency approximation.

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  • Received 10 July 2017

DOI:https://doi.org/10.1103/PhysRevD.96.064018

© 2017 American Physical Society

Physics Subject Headings (PhySH)

Gravitation, Cosmology & Astrophysics

Authors & Affiliations

Béatrice Bonga*

  • Institute for Gravitation and the Cosmos and Physics Department, Pennsylvania State University, University Park, Pennsylvania 16802, USA

Jeffrey S. Hazboun

  • Center for Advanced Radio Astronomy, University of Texas Rio Grande Valley, Brownsville Texas 78520, USA

  • *bpb165@psu.edu

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Issue

Vol. 96, Iss. 6 — 15 September 2017

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