Probing anisotropies of the Stochastic Gravitational Wave Background with LISA
File(s)2201.08782v1.pdf (2.76 MB)
Accepted version
Author(s)
Type
Journal Article
Abstract
We investigate the sensitivity of the Laser Interferometer Space Antenna (LISA) to the anisotropies of the Stochastic Gravitational Wave Background (SGWB). We first discuss the main astrophysical and cosmological sources of SGWB which are characterized by anisotropies in the GW energy density, and we build a Signal-to-Noise estimator to quantify the sensitivity of LISA to different multipoles. We then perform a Fisher matrix analysis of the prospects of detectability of anisotropic features with LISA for individual multipoles, focusing on a SGWB with a power-law frequency profile. We compute the noise angular spectrum taking into account the specific scan strategy of the LISA detector. We analyze the case of the kinematic dipole and quadrupole generated by Doppler boosting an isotropic SGWB. We find that β ΩGW ∼ 2 × 10-11 is required to observe a dipolar signal with LISA. The detector response to the quadrupole has a factor ∼ 103 β relative to that of the dipole. The characterization of the anisotropies, both from a theoretical perspective and from a map-making point of view, allows us to extract information that can be used to understand the origin of the SGWB, and to discriminate among distinct superimposed SGWB sources.
Date Issued
2022-11
Date Acceptance
2022-10-20
Citation
Journal of Cosmology and Astroparticle Physics, 2022, 2022 (11)
ISSN
1475-7516
Publisher
IOP Publishing
Journal / Book Title
Journal of Cosmology and Astroparticle Physics
Volume
2022
Issue
11
Copyright Statement
Copyright © 2022 IOP Publishing Ltd. This is an author-created, un-copyedited version of an article accepted for publication/published in Journal of Cosmology and Astroparticle Physics, IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at https://iopscience.iop.org/article/10.1088/1475-7516/2022/11/009
Identifier
https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000899443700009&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=a2bf6146997ec60c407a63945d4e92bb
Subjects
ANGULAR RESOLUTION
Astronomy & Astrophysics
BINARIES
gravitational wave detectors
gravitational waves / sources
gravitational waves / theory
HISTORY
Physical Sciences
Physics
physics of the early universe
Physics, Particles & Fields
Science & Technology
TIME
Publication Status
Published
Article Number
009
Date Publish Online
2022-11-08