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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

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

David Alonso , Giulia Cusin , Pedro G. Ferreira , Cyril Pitrou This is my paper
classification astro-ph.CO astro-ph.GAastro-ph.IMgr-qchep-th
keywords gravitationalwavebackgroundnoiseshotanisotropycross-correlatinggalaxy
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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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