IRIS Università degli Studi di Padovahttps://www.research.unipd.itIl sistema di repository digitale IRIS acquisisce, archivia, indicizza, conserva e rende accessibili prodotti digitali della ricerca.Sat, 28 May 2022 07:02:18 GMT2022-05-28T07:02:18Z1031Gravitational Wave mergers as tracers of Large Scale Structureshttp://hdl.handle.net/11577/3388443Titolo: Gravitational Wave mergers as tracers of Large Scale Structures
Abstract: Clustering measurements of Gravitational Wave (GW) mergers in Luminosity Distance Space can be used in the future as a powerful tool for Cosmology. We consider tomographic measurements of the Angular Power Spectrum of mergers both in an Einstein Telescope-like detector network and in some more advanced scenarios (more sources, better distance measurements, better sky localization). We produce Fisher forecasts for both cosmological (matter and dark energy) and merger bias parameters. Our fiducial model for the number distribution and bias of GW events is based on results from hydrodynamical simulations. The cosmological parameter forecasts with Einstein Telescope are less powerful than those achievable in the near future via galaxy clustering observations with, e.g., Euclid. However, in the more advanced scenarios we see significant improvements. Moreover, we show that bias can be detected at high statistical significance. Regardless of the specific constraining power of different experiments, many aspects make this type of analysis interesting anyway. For example, compact binary mergers detected by Einstein Telescope will extend up to very high redshifts, particularly for binary black holes. Furthermore, Luminosity Distance Space Distortions in the GW analysis have a different structure with respect to Redshift-Space Distortions in galaxy catalogues. Finally, measurements of the bias of GW mergers can provide useful insight into their physical nature and properties.
Fri, 01 Jan 2021 00:00:00 GMThttp://hdl.handle.net/11577/33884432021-01-01T00:00:00ZThe properties of merging black holes and neutron stars across cosmic timehttp://hdl.handle.net/11577/3308427Titolo: The properties of merging black holes and neutron stars across cosmic time
Tue, 01 Jan 2019 00:00:00 GMThttp://hdl.handle.net/11577/33084272019-01-01T00:00:00ZClustering of Gravitational Wave and Supernovae events: a multitracer analysis in Luminosity Distance Spacehttp://hdl.handle.net/11577/3415283Titolo: Clustering of Gravitational Wave and Supernovae events: a multitracer analysis in Luminosity Distance Space
Abstract: We study the clustering of Gravitational Wave (GW) merger events and Supernovae IA (SN), as cosmic tracers in Luminosity Distance Space. We modify the publicly available CAMB code to numerically evaluate auto- and cross- power spectra for the different sources, including Luminosity Distance Space distortion effects generated by peculiar velocities and lensing convergence. We perform a multitracer Fisher analysis to forecast expected constraints on cosmological and GW bias coefficients, using outputs from hydrodinamical N-body simulations to determine the bias fiducial model and considering future observations from the Vera Rubin Observatory and Einstein Telescope (ET), both single and in a 3 detector network configuration. We find that adding SN to the GW merger dataset considerably improves the forecast, mostly by breaking significant parameter degeneracies, with final constraints comparable to those obtainable from a Euclid-like survey. GW merger bias is forecasted to be detectable with good significance even in the single ET case.
Sat, 01 Jan 2022 00:00:00 GMThttp://hdl.handle.net/11577/34152832022-01-01T00:00:00Z