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BEGIN:VEVENT
UID:0-742@lptms.universite-paris-saclay.fr
DTSTART:20200910T140000Z
DTEND:20200910T163000Z
DTSTAMP:20200902T095329Z
URL:http://www.lptms.universite-paris-saclay.fr/seminars/soutenance-de-the
 se-mathieu-isoard/
SUMMARY:Soutenance de thèse: Mathieu Isoard - Grand amphi\, bâtiment Pasc
 al n° 530 - 10 Sep 20 14:00
DESCRIPTION:Theoretical study of quantum correlations and nonlinear fluctua
 tions in quantum gases\npar\n\nMathieu Isoard\n&nbsp\;\n\nJury:\n\nMatteo 
 Conforti\, Université Lille\, rapporteur\n\nPatrik Öhberg\, Heriot-Watt 
 University\, rapporteur\n\nÉlisabeth Giacobino\, CNRS\, examinatrice\n\nS
 andro Stringari\, University of Trento\, examinateur\n\nChris Westbrook\, 
 Institut d’Optique\, examinateur\n\nNicolas Pavloff\, Université Paris-
 Saclay/CNRS \, directeur de thèse\n\n&nbsp\;\n\nResumé\n\nThis thesis is
  dedicated to the study of nonlinear-driven phenomena in two quantum gases
  which bear important similarities: Bose-Einstein condensates of ultracold
  atomic vapors and paraxial nonlinear laser beam.\n\nThese systems can be 
 described within a hydrodynamic framework which make it possible to invest
 igate their short and long time propagation by means of mathematical metho
 ds developed by Riemann and Whitham. In particular\, we study the formatio
 n and the propagation of dispersive shock waves which arise after a wave b
 reaking event. We obtain a kind of a weak shock theory\, from which we can
  extract a quantitative description of experimentally relevant parameters\
 , such as the velocity of the solitonic edge of the shock or the contrast 
 of its fringes.\n\n\n\n\n\nIn a second part\, we study sonic analogues of 
 black holes. In a Bose-Einstein condensate\, it is possible to implement a
  stationary configuration with a current flowing from a subsonic region to
  a supersonic one. This mimics a black hole\, since sonic excitations cann
 ot escape the supersonic region. Besides\, quantizing the phonon field lea
 ds to a sonic analogue of Hawking radiation. In this thesis\, we have show
 n that a correct account of zero modes is essential for an accurate descri
 ption of the Hawking process\, and results in a excellent comparison with 
 recent experimental datas. In addition\, we characterize the entanglement 
 shared among quantum excitations and show that they exhibit tripartite ent
 anglement.\n\n\n\n\n
CATEGORIES:seminars
LOCATION:Grand amphi\, bâtiment Pascal n° 530\, rue André Rivière\, Ors
 ay\, 91405\, France
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=rue André Rivière\, Orsay
 \, 91405\, France;X-APPLE-RADIUS=100;X-TITLE=Grand amphi\, bâtiment Pasca
 l n° 530:geo:0,0
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