I.F.T.
Almuerzo-Seminario
(Lunch seminar)
March 7th 2000, 15:00 p.m.
Black holes in Bose-Einstein Condensates
Luis Garay
(IMAFF, CSIC)
The sonic analogue of a gravitational black hole in dilute-gas
Bose-Einstein condensates is investigated. It is shown that
there exist both dynamically stable and unstable configurations
which, in the hydrodynamic limit, exhibit a behaviour completely
analogous to that of gravitational black holes. The dynamical
instabilities involve creation of quasiparticle pairs in
positive and negative energy states, just as in the well-known
suggested mechanism for black hole evaporation. We have also
simulated the creation of a stable sonic black hole by solving
the full Gross-Pitaevskii equation numerically for a condensate
in which its characteristic parameters are changed
adiabatically. A sonic black hole could in this way be created
experimentally with state-of-the-art or planned technology.
Where: Modulo C-XVI, 3rd floor,
Facultad de Ciencias U.A.M., C.U. Cantoblanco, 28049-Madrid
For more information about seminars at the I.F.T. e-mail
José Ramón Espinosa
or phone +34-91-397 4418.
Last modified: Fri Feb 25 14:02:38 CET 2000