Cosmology and dark energy from joint gravitational wave-GRB observations

Enis Belgacem, Yves Dirian, Stefano Foffa, Eric J. Howell, Michele Maggiore, Tania Regimbau

Research output: Contribution to journalArticle

Abstract

Gravitational-wave (GW) detectors can contribute to the measurement of cosmological parameters and to testing the dark-energy sector of alternatives to ΛCDM, by using standard sirens. In this paper we focus on binary neutron stars with a counterpart detected through a gamma-ray burst (GRB), both at a second-generation network made by advanced LIGO+advanced Virgo+LIGO India+Kagra, and at third-generation (3G) detectors, discussing in particular the cases of a single Einstein Telescope (ET), and of a network of ET plus two Cosmic Explorer (CE). We construct mock catalogs of standard sirens, using different scenarios for the local merger rate and for the detection of the electromagnetic counterpart. For 3G detectors we estimate the coincidences with a GRB detector with the characteristics of the proposed THESEUS mission. We discuss how these standard sirens with a GRB counterpart can improve the determination of cosmological parameters (and particularly of H0) in ΛCDM, and we then study how to extract information on dark energy, considering both a non-trivial dark energy equation of state and modified GW propagation. We find that a 2G detector network can already reach, over several years of data taking, an interesting sensitivity to modified GW propagation, while a single ET detector would have a remarkable potential for discovery. We also find that, to fully exploit the potential of a ET+CE+CE network, it is necessary a much stronger program of search for electromagnetic counterparts (or else to resort to statistical methods for standard sirens), and furthermore gravitational lensing can become a limiting factor.

Original languageEnglish
Article number015
JournalJournal of Cosmology and Astroparticle Physics
Volume2019
Issue number8
DOIs
Publication statusPublished - 13 Aug 2019

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sirens
dark energy
gamma ray bursts
gravitational waves
cosmology
detectors
telescopes
LIGO (observatory)
energy
wave propagation
electromagnetism
binary stars
India
neutron stars
catalogs
equations of state
sectors
sensitivity
estimates

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Belgacem, Enis ; Dirian, Yves ; Foffa, Stefano ; Howell, Eric J. ; Maggiore, Michele ; Regimbau, Tania. / Cosmology and dark energy from joint gravitational wave-GRB observations. In: Journal of Cosmology and Astroparticle Physics. 2019 ; Vol. 2019, No. 8.
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Cosmology and dark energy from joint gravitational wave-GRB observations. / Belgacem, Enis; Dirian, Yves; Foffa, Stefano; Howell, Eric J.; Maggiore, Michele; Regimbau, Tania.

In: Journal of Cosmology and Astroparticle Physics, Vol. 2019, No. 8, 015, 13.08.2019.

Research output: Contribution to journalArticle

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AU - Belgacem, Enis

AU - Dirian, Yves

AU - Foffa, Stefano

AU - Howell, Eric J.

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AU - Regimbau, Tania

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