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Detecting the anisotropic astrophysical gravitational wave background in the presence of shot noise through cross-correlations

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arxiv 2002.02888 v1 pith:LULM4BAB submitted 2020-02-07 astro-ph.CO astro-ph.GAastro-ph.IMgr-qchep-th

classification astro-ph.COastro-ph.GAastro-ph.IMgr-qchep-th
keywords gravitationalwavebackgroundnoiseshotanisotropycross-correlatinggalaxy
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The spatial and temporal discreteness of gravitational wave sources leads to shot noise that may, in some regimes, swamp any attempts at measuring the anisotropy of the gravitational wave background. Cross-correlating a gravitational wave background map with a sufficiently dense galaxy survey can alleviate this issue, and potentially recover some of the underlying properties of the gravitational wave background. We quantify the shot noise level and we explicitly show that cross-correlating the gravitational wave background and a galaxy catalog improves the chances of a first detection of the background anisotropy with a gravitational wave observatory operating in the frequency range (10Hz,100Hz), given sufficient sensitivity.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Directional Search for Persistent Gravitational Waves: Results from the First Part of LIGO-Virgo-KAGRA's Fourth Observing Run

    gr-qc 2025-10 conditional novelty 6.0 of 10

    An 8.3-year LIGO–Virgo–KAGRA search for persistent, direction-dependent gravitational waves finds no signal and yields the most restrictive upper limits to date on anisotropic backgrounds and targeted sources.

  2. Imprints of Large-Scale Structures in the Anisotropies of the Cosmological Gravitational Wave Background

    astro-ph.CO 2025-05 conditional novelty 6.0 of 10

    The cosmological gravitational wave background is predicted to cross-correlate with galaxy positions through the late integrated Sachs-Wolfe effect, giving a source-discrimination handle and a forecast improvement of ...

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