| Texto completo | |
| Autor(es): |
Mosna, Ricardo A.
;
Pitelli, Joao Paulo M.
;
Richartz, Mauricio
Número total de Autores: 3
|
| Tipo de documento: | Artigo Científico |
| Fonte: | PHYSICAL REVIEW D; v. 94, n. 10, p. 6-pg., 2016-11-28. |
| Resumo | |
We introduce an analogue model for a nonglobally hyperbolic spacetime in terms of a two-dimensional fluid. This is done by considering the propagation of sound waves in a radial flow with constant velocity. We show that the equation of motion satisfied by sound waves is the wave equation on AdS(2) x S-1. Since this spacetime is not globally hyperbolic, the dynamics of the Klein-Gordon field is not well defined until boundary conditions at the spatial boundary of AdS(2) are prescribed. On the analogue model end, those extra boundary conditions provide an effective description of the point source at r = 0. For waves with circular symmetry, we relate the different physical evolutions to the phase difference between ingoing and outgoing scattered waves. We also show that the fluid configuration can be stable or unstable depending on the chosen boundary condition. (AU) | |
| Processo FAPESP: | 13/09357-9 - Física e geometria do espaço-tempo |
| Beneficiário: | Alberto Vazquez Saa |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |
| Processo FAPESP: | 16/07057-6 - Aplicações da Teoria de Extensões Auto-Adjuntas em Gravitação Quântica |
| Beneficiário: | João Paulo Pitelli Manoel |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |