Rotational Superradiance in Fluids and in Astrophysics

Data: 
06/12/2017 - 14:00 - 15:00
Local: 
Auditório IAG, Bloco G

Rotational Superradiance in Fluids and in Astrophysics

 

Mauricio Richartz

CMCC/UFABC

 

Abstract:
Rotational superradiance, i.e. the possibility of extracting rotational energy from an object through wave scattering, was predicted by Zel'dovich 45 years ago. It was recently observed in the laboratory using surface waves propagating on a vortex flow of water. It is also expected to occur around rotating black holes and might even be important in some astrophysical processes. In this talk, I will explain the theory behind superradiant scattering and the details of the experiment that was able to detect the phenomenon in the laboratory. I will also discuss some possible implications of the effect in Astrophysics, specially in this new era of gravitational wave astronomy.