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Superradiance in dissipative systems

Grant number: 15/14077-0
Support type:Scholarships abroad - Research
Effective date (Start): October 01, 2015
Effective date (End): November 30, 2015
Field of knowledge:Physical Sciences and Mathematics - Physics
Principal Investigator:Maurício Richartz
Grantee:Maurício Richartz
Host: Silke Weinfurtner
Home Institution: Centro de Matemática, Computação e Cognição (CMCC). Universidade Federal do ABC (UFABC). Ministério da Educação (Brasil). Santo André , SP, Brazil
Local de pesquisa : University of Nottingham, University Park, England  
Associated research grant:13/09357-9 - Physics and geometry of spacetime, AP.TEM

Abstract

Superradiance is the phenomenon in which incident waves are amplified after being reflected by a scattering potential. This amplification depends basically on the boundary conditions associated with the wave equation that describes the problem. It can occur, for example, for waves scattered by a rotating and/or charged black hole and for waves scattered in an axisymmetric system with dissipation (like Zel'dovich's cylinder). Analogue models of gravity, on the other hand, are physical systems whose behaviour can be described by classical/quantum fields in a curved spacetime. These analogue models represent an alternative way to test, both theoretically and experimentally, predictions of the quantum field theory in curved spacetimes. The aim of this project is to study superradiance in dissipative systems (in particular, in analogue models of gravity without black holes, but in which some form of energy dissipation is present). In order to accomplish this, we propose a short-duration visit (2 months) to the University of Nottingham, UK, for a scientific collaboration with Dr. Silke Wienfurtner and her group. The collaboration will allow both the theoretical analysis of the problem and the participation of the proponent in the hidrodynamical experiments related to analogue models of gravity being led by Dr. Silke Weinfurtner. (AU)

Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
TORRES, THEO; PATRICK, SAM; COUTANT, ANTONIN; RICHARTZ, MAURICIO; TEDFORD, EDMUND W.; WEINFURTNER, SILKE. Rotational superradiant scattering in a vortex flow. Nature Physics, v. 13, n. 9, p. 833+, SEP 2017. Web of Science Citations: 45.
CARDOSO, VITOR; COUTANT, ANTONIN; RICHARTZ, MAURICIO; WEINFURTNER, SILKE. Detecting Rotational Superradiance in Fluid Laboratories. Physical Review Letters, v. 117, n. 27 DEC 29 2016. Web of Science Citations: 13.
RICHARTZ, MAURICIO. Quasinormal modes of extremal black holes. Physical Review D, v. 93, n. 6 MAR 25 2016. Web of Science Citations: 12.

Please report errors in scientific publications list by writing to: cdi@fapesp.br.