Improved limits on a stochastic gravitational-wave background and its anisotropies from Advanced LIGO O1 and O2 runs

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Title: Improved limits on a stochastic gravitational-wave background and its anisotropies from Advanced LIGO O1 and O2 runs
Authors: Renzini, A
Contaldi, CR
Item Type: Journal Article
Abstract: We integrate the entire, publicly available, Advanced LIGO dataset to obtain maximum-likelihood constraint maps of the stochastic gravitational-wave background (SGWB). From these, we derive limits on the energy density of the stochastic background Ω GW and its anisotropy. We find 95% confident limits Ω GW < 5.2 × 10 − 8 at 50 Hz for a spectral index α = 2 / 3 consistent with a stochastic background due to inspiral events and Ω GW < 3.2 × 10 − 7 for a scale (frequency) invariant spectrum. We also report upper limits on the angular power spectra C ℓ for three broadband integrations of the data. Finally, we present an estimate in which we integrate the data into ten separate spectral bins as a first attempt to carry out a model-independent estimate of the SGWB and its anisotropies.
Issue Date: 20-Sep-2019
Date of Acceptance: 1-Sep-2019
URI: http://hdl.handle.net/10044/1/73935
DOI: https://doi.org/10.1103/PhysRevD.100.063527
ISSN: 1550-2368
Publisher: American Physical Society
Start Page: 063527-1
End Page: 063527-9
Journal / Book Title: Physical Review D: Particles, Fields, Gravitation and Cosmology
Volume: 100
Issue: 6
Copyright Statement: © 2019 American Physical Society
Sponsor/Funder: Science and Technology Facilities Council
Science and Technology Facilities Council (STFC)
Funder's Grant Number: ST-N000838
ST/N000838/1
Keywords: Science & Technology
Physical Sciences
Astronomy & Astrophysics
Physics, Particles & Fields
Physics
Science & Technology
Physical Sciences
Astronomy & Astrophysics
Physics, Particles & Fields
Physics
gr-qc
gr-qc
astro-ph.CO
astro-ph.IM
Publication Status: Published
Article Number: ARTN 063527
Online Publication Date: 2019-09-20
Appears in Collections:Physics
Theoretical Physics



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