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Acoustic white holes in flowing atomic Bose-Einstein condensates
Mayoral C., Recati A., Fabbri A., Parentani R., Balbinot R. et al
New Journal of Physics 13 (2011) 025007 - http://hal.archives-ouvertes.fr/hal-00546007
Physique/Matière Condensée/Gaz Quantiques
Physique/Relativité Générale et Cosmologie Quantique
Physique/Physique des Hautes Energies - Théorie
Acoustic white holes in flowing atomic Bose-Einstein condensates
C. Mayoral1, A. Recati2, A. Fabbri1, 3, R. Parentani4, R. Balbinot5, I. Carusotto2
1 :  Departamento de Fisica Teorica and IFIC
Universitad de Valencia-CSIC
C.Dr. Moliner 50, 46100 Burjassot
Espagne
2 :  INO-CNR BEC - Università di Trento
UNIVERSITÀ DEGLI STUDI DI TRENTO
Italie
3 :  APC - UMR 7164 - AstroParticule et Cosmologie
http://www.apc.univ-paris7.fr/
CNRS : UMR7164 – IN2P3 – Observatoire de Paris – Université Paris VII - Paris Diderot – CEA : DSM/IRFU
APC - UMR 7164, Université Paris Diderot, 10 rue Alice Domon et Léonie Duquet, case postale 7020, F-75205 Paris Cedex 13
France
4 :  LPT - Laboratoire de Physique Théorique d'Orsay [Orsay]
CNRS : UMR8627 – Université Paris XI - Paris Sud
Bâtiment 210 Université Paris XI 91405 Orsay Cedex
France
5 :  Dipartimento di Fisica
Universita di Bologna and INFN
Sezione di Bologna, Via Irnerio 46, 40126 Bologna
Italie
APC - THEORIE
We study acoustic white holes in a steadily flowing atomic Bose-Einstein condensate. A white hole configuration is obtained when the flow velocity goes from a super-sonic value in the upstream region to a sub-sonic one in the downstream region. The scattering of phonon wavepackets on a white hole horizon is numerically studied in terms of the Gross-Pitaevskii equation of mean-field theory: dynamical stability of the acoustic white hole is found, as well as a signature of a nonlinear back-action of the incident phonon wavepacket onto the horizon. The correlation pattern of density fluctuations is numerically studied by means of the truncated-Wigner method which includes quantum fluctuations. Signatures of the white hole radiation of correlated phonon pairs by the horizon are characterized; analogies and differences with Hawking radiation from acoustic black holes are discussed. In particular, a short wavelength feature is identified in the density correlation function, whose amplitude steadily grows in time since the formation of the horizon. The numerical observations are quantitatively interpreted by means of an analytical Bogoliubov theory of quantum fluctuations for a white hole configuration within the step-like horizon approximation.
Anglais
30/09/2010

New Journal of Physics (New. J. Phys.)
Publisher Institute of Physics: Open Access Journals
ISSN 1367-2630 
internationale
Articles dans des revues avec comité de lecture
2011
13
025007

LPT-ORSAY 10-98

Lien vers le texte intégral : 
http://fr.arXiv.org/abs/1009.6196