Robust Cosmic Standard Ruler from the Cross-Correlation of Galaxies and Dark Sirens
Speaker
Date
Time
Place
Room 7S1
Abstract
Dark sirens are sources of gravitational waves (typically mergers of black hole binaries) without an electromagnetic counterpart. The gravitational waveform measured by our detectors (LIGO and others) allows us to infer the distance (not the redshift) to those sources. In this talk, I will show that by correlating dark sirens and galaxies we can directly draw the Hubble redshift-distance relation, with minimal assumptions about the underlying cosmology. This allows for a direct measurement of the Hubble parameter, free of the systematics of standard sirens and without the model dependence of the Planck constraint. Using this technique we will be able to achieve an accuracy of 4% with run 5 of the LIGO-Virgo-Kagra network of gravitational wave detectors, and less than 1% with the future facility Einstein Telescope.
Biography
Raul Abramo is a cosmologist and professor at the University of São Paulo, specializing in theoretical and observational cosmology. He earned his PhD in physics from Brown University in 1997 and later conducted postdoctoral research at the University of Florida. His research focuses on large-scale astrophysical surveys to study dark matter, dark energy, and the universe’s large-scale structure.