Upper limits on the stochastic gravitational-wave background from advanced LIGO's first observing run

LIGO Scientific Collaboration and Virgo Collaboration

Research output: Contribution to journalArticlepeer-review

139 Citations (Scopus)
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Abstract

A wide variety of astrophysical and cosmological sources are expected to contribute to a stochastic gravitational-wave background. Following the observations of GW150914 and GW151226, the rate and mass of coalescing binary black holes appear to be greater than many previous expectations. As a result, the stochastic background from unresolved compact binary coalescences is expected to be particularly loud. We perform a search for the isotropic stochastic gravitational-wave background using data from Advanced Laser Interferometer Gravitational Wave Observatory's (aLIGO) first observing run. The data display no evidence of a stochastic gravitational-wave signal. We constrain the dimensionless energy density of gravitational waves to be Ω0<1.7×10-7 with 95% confidence, assuming a flat energy density spectrum in the most sensitive part of the LIGO band (20-86 Hz). This is a factor of ∼33 times more sensitive than previous measurements. We also constrain arbitrary power-law spectra. Finally, we investigate the implications of this search for the background of binary black holes using an astrophysical model for the background.

Original languageEnglish
Article number121101
Pages (from-to)1-12
Number of pages12
JournalPhysical Review Letters
Volume118
Issue number12
DOIs
Publication statusPublished - 24 Mar 2017

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