Seminário de Astronomia: Hubble diagram from galaxies and dark sirens

Data

Horário de início

14:00

Local

Auditório “Prof. Paulo Benevides Soares” – IAG/USP (Rua do Matão, 1226 - Cidade Universitária)

SEMINÁRIO DO DEPARTAMENTO DE ASTRONOMIA

Hubble diagram from galaxies and dark sirens

a talk by Prof. Raul Abramo (Instituto de Física - USP) - In-Person

 

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 allow us to infer the distance (not the redshift) to those sources, and with the new generation of detectors such as the Einstein Telescope, the uncertainty in their angular position and distance will decrease dramatically. In this seminar 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.

 

Short-Bio:

Raul Abramo é Ph.D. pela Brown University e professor titular do Instituto de Física da USP. Sua pesquisa tem se focado em temas de cosmologia observacional, em particular levantamentos de galáxias e temas correlatos.

 

Google Meet: https://meet.google.com/pcw-gmem-jyi
Link da transmissão: https://www.youtube.com/c/AstronomiaIAGUSP/live