Marios Kalomenopoulos
Gather.town id
GW04
Poster Title
Clustering effects on GWs Dark Sirens determination of Ho
Institution
University of Edinburgh
Abstract (short summary)
Gravitational waves (GWs) can be used to measure the Hubble parameter. The optimal technique, a "Standard Siren", requires the identification of the electromagnetic (E/M) counterpart of the GW source. However, a significant fraction of GWs will not have E/M counterparts. Such "Dark Sirens" can still help constrain the Hubble parameter by statistical techniques. In this work we investigate the power of this method using high-resolution, cosmological simulations that include realistic clustering effects. In addition, we quantify the role of catalogue incompleteness, i.e. the lack of certain galaxies from our catalogues due to observational limitations, when applying this technique.
Plain text (extended) Summary
The Hubble Tension (i.e. the discrepancy on Ho values from different methods) is one of the most interesting problems in modern cosmology. GWs can provide an independent measurement of this. In the ideal situation, we are going to have an EM counterpart to our GW source, which can provide its redshift. However, for the majority of expected sources (BH binaries), we do not expect to have an EM pair. In this case, we can try to cross-correlate the sky localisation of the GW source with galaxy catalogues. Then all the galaxies in the region can act as potential hosts of the GW source. Combining many such observations, we expect that to converge to the "true" value of Ho. In this work, we quantify the success of this method by using realistic clustering effects from a high-resolution cosmological simulation. We also investigate how clustering can help in the case we have incomplete galaxy catalogues, due to observational limitations.
URL
mariok@roe.ac.uk
Poster file