Superradiance and Hawking radiation in hydrodynamical vortex flows
Perturbative analysis of black holes via the isomonodromic method
| Full text | |
| Author(s): |
Richartz, Mauricio
;
Prain, Angus
;
Liberati, Stefano
;
Weinfurtner, Silke
Total Authors: 4
|
| Document type: | Journal article |
| Source: | PHYSICAL REVIEW D; v. 91, n. 12, p. 12-pg., 2015-06-05. |
| Abstract | |
In a draining rotating fluid flow background, surface perturbations behave as a scalar field on a rotating effective black hole spacetime. We propose a new model for the background flow which takes into account the varying depth of the water. Numerical integration of the associated Klein-Gordon equation using accessible experimental parameters shows that gravity waves in an appropriate frequency range are amplified through the mechanism of superradiance. Our numerical results suggest that the observation of this phenomenon in a common fluid mechanical system is within experimental reach. Unlike the case of wave scattering around Kerr black holes, which depends only on one dimensionless background parameter (the ratio a/M between the specific angular momentum and the mass of the black hole), our system depends on two dimensionless background parameters, namely the normalized angular velocity and surface gravity at the effective black hole horizon. (AU) | |
| FAPESP's process: | 13/09357-9 - Physics and geometry of spacetime |
| Grantee: | Alberto Vazquez Saa |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 13/15748-0 - Analogue Models: superradiance and stability |
| Grantee: | Maurício Richartz |
| Support Opportunities: | Scholarships abroad - Research |