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First predictions of the angular power spectrum of the astrophysical gravitational wave background

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arxiv 1803.03236 v2 pith:KV7R22LK submitted 2018-03-08 astro-ph.CO astro-ph.GAgr-qchep-th

First predictions of the angular power spectrum of the astrophysical gravitational wave background

classification astro-ph.CO astro-ph.GAgr-qchep-th
keywords astrophysicalangularbackgroundgravitationalpowerspectrumwavefirst
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We present the first predictions for the angular power spectrum of the astrophysical gravitational wave background constituted of the radiation emitted by all resolved and unresolved astrophysical sources. Its shape and amplitude depend on both the astrophysical properties on galactic scales and on cosmological properties. We show that the angular power spectrum behaves as $C_{\ell}\propto 1/{\ell}$ on large scales and that relative fluctuations of the signal are of order 30% at 100 Hz. We also present the correlations of the astrophysical gravitational wave background with weak-lensing and galaxy distribution. These numerical results pave the way to the study of a new observable at the crossroad between general relativity, astrophysics and cosmology.

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