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DTSTART;TZID=Europe/Paris:20260323T113000
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SUMMARY:[Séminaire atomes froids] Nicolas Cherroret (LKB)
CREATED:20260105T094621Z
DTSTAMP:20260105T094621Z
URL:https://www.lptmc.jussieu.fr/vie-scientifique/listeseminaires/seminaire-atomes-froids-4
DESCRIPTION:Non-thermal fixed points in far-from-equilibrium 3D Bose gases\NRésumé: \NFollowing a quantum quench, local observables in many-body systems typically thermal-ize. In certain cases, however, this thermalization occurs via a two-stage process: the systemfirst exhibits universal dynamical scaling laws with strongly non-thermal properties, beforeeventually reaching thermal equilibrium on a longer time scale. This phenomenon is referredto as a non-thermal fixed point.In this talk, I will discuss the non-thermal fixed point that emerges when a 3D Bose gas isquenched across the condensation transition. I will show that it generally involves a transient"weak turbulence" regime, followed at later times by a coarsening dynamics associated withthe slow recombination of vortex lines. Quenches performed exactly at the critical point, incontrast, display a distinct coarsening dynamics, presumably without vortices but involvingthe diffusion of critical fluctuations. If time permits, I will also discuss the robustness ofthis universal dynamics against external perturbations, typically disorder and drive.
X-ALT-DESC;FMTTYPE=text/html:<h2>Non-thermal fixed points in far-from-equilibrium 3D Bose gases</h2><p>Résumé:&nbsp;</p><p>Following a quantum quench, local observables in many-body systems typically thermal-<br />ize. In certain cases, however, this thermalization occurs via a two-stage process: the system<br />first exhibits universal dynamical scaling laws with strongly non-thermal properties, before<br />eventually reaching thermal equilibrium on a longer time scale. This phenomenon is referred<br />to as a non-thermal fixed point.<br />In this talk, I will discuss the non-thermal fixed point that emerges when a 3D Bose gas is<br />quenched across the condensation transition. I will show that it generally involves a transient<br />"weak turbulence" regime, followed at later times by a coarsening dynamics associated with<br />the slow recombination of vortex lines. Quenches performed exactly at the critical point, in<br />contrast, display a distinct coarsening dynamics, presumably without vortices but involving<br />the diffusion of critical fluctuations. If time permits, I will also discuss the robustness of<br />this universal dynamics against external perturbations, typically disorder and drive.</p>
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SUMMARY:[Séminaire atomes froids] Félix Werner (LKB)
CREATED:20260323T101234Z
DTSTAMP:20260323T101234Z
URL:https://www.lptmc.jussieu.fr/vie-scientifique/listeseminaires/seminaire-atomes-froids-felix-werner-lkb
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DTSTART;TZID=Europe/Paris:20260914T113000
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UID:393E80E1-933F-42D3-8E4A-290EB98B8ADB
SUMMARY:[Séminaire atomes froids] Pascal Naidon (RIKEN)
CREATED:20260908T111340Z
DTSTAMP:20260908T111340Z
URL:https://sematomesfroids.sciencesconf.org/
DESCRIPTION:Résumé sur https://sematomesfroids.sciencesconf.org/
X-ALT-DESC;FMTTYPE=text/html:<p>Résumé sur&nbsp;<a href="https://sematomesfroids.sciencesconf.org/">https://sematomesfroids.sciencesconf.org/</a></p>
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DTSTART;TZID=Europe/Paris:20261119T113000
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UID:DB66C960-E974-43F1-8E55-875597EBE324
SUMMARY:[Séminaire atomes froids] Uri Sharell (Université d'Heidelberg)
CREATED:20260914T113933Z
DTSTAMP:20260914T113933Z
URL:https://sematomesfroids.sciencesconf.org/
DESCRIPTION:Résumé sur https://sematomesfroids.sciencesconf.org/
X-ALT-DESC;FMTTYPE=text/html:<p>Résumé sur&nbsp;<a href="https://sematomesfroids.sciencesconf.org/">https://sematomesfroids.sciencesconf.org/</a></p>
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