Avviso di Seminario - Characterization of an astrophysical background of gravitational waves: anisotropies, polarization and cross-correlations with cosmological observables - 3/10/2019

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GRUPPO TEORICO
AVVISO DI SEMINARIO

Giovedì 3 ottobre 2019 - ore 15:00
Dipartimento di Fisica - Largo B.Pontecorvo, 3
Aula 248 - primo piano - Ed. C

Giulia Cusin
(Oxford University)

Terrà un seminario dal titolo:
Characterization of an astrophysical background of gravitational waves: anisotropies, polarization and cross-correlations with cosmological observables
Abstract: The astrophysical background of gravitational waves (AGWB) is composed by the incoherent superposition of gravitational wave signals emitted by a large number of resolved and unresolved astrophysical sources from the onset of stellar activity until today. I present a theoretical framework to fully characterize the AGWB in terms of energy density anisotropies and polarization and I present the first numerical predictions for the angular power spectra of anisotropies in the LIGO/Virgo and LISA frequency bands, and for cross-correlations with electromagnetic observables e.g. weak lensing and galaxy number counts. I show that the anisotropies of the stochastic background contain additional information on sub-galactic processes, complementary to the isotropic background and individual mergers. I then illustrate and discuss the astrophysical implications of this study.

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