Speaker
Description
Third generation gravitational waves (GWs) observatories such as Einstein Telescope and Cosmic Explorer will yield an abundance of extra-galactic transient objects. Cross-correlations using GW merger events offer novel and powerful insights into the large-scale distribution of matter in the universe. These sources carry information on their luminosity distance, but remain uninformative about their redshifts; hence their clustering analyses and cross-correlations need to be carried out in luminosity distance space, as opposed to redshift space. Further, the large volumes accessible to these surveys imply that we may need to include relativistic corrections, such as lensing and Doppler magnification. However, the amplitude of these effects depends on the magnification and evolution biases of the transient sources, which are not yet understood. In this talk, I present a comparison of the number count angular power spectra between luminosity distance and redshift spaces, highlighting the inaccuracy of GWs clustering analysis when carried out in a different space, particularly at larger scales. Then, we employ Fisher forecasts to constrain the clustering, magnification and evolution biases of GWs from binary black hole (BBH) mergers in luminosity distance space, accounting for all relativistic effects. Constraining the bias parameters effectively implies constraining properties of the BBH population responsible for GWs emissions, thus potentially inferring both their redshift and mass distributions.
