Speaker
Description
Multi-probe techniques have proven to be powerful tools in modern cosmology.
By combining different observational tracers, they break degeneracies and provide new ways to gain insights into the large-scale structure (LSS) of the Universe and its evolution.
In this talk, we explore the potential of cross-correlation between gravitational waves (GWs) and 21cm intensity mapping from neutral hydrogen emission (HI), focusing on its role in view of future high-precision observatories, specifically Einstein Telescope (ET) and the Square Kilometer Array Observatory (SKA Observatory).
Assuming that GW and HI are different tracers of the same underlying dark matter density field, we run a tomographic full-likelihood MCMC pipeline and infer cosmological parameters from both the angular power spectrum (auto-correlation) and the angular cross-power spectrum (cross-correlation) of these probes.
We show that synergies between future GW and HI experiments will significantly improve standard-sirens measurements, thanks to increased sensitivity and high-redshift coverage, allowing us to constrain cosmological parameters to a level comparable to that of well-established alternative probes.