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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:3
UID:UW-Physics-Event-6469
DTSTART:20211022T203000Z
DTEND:20211022T213000Z
DTSTAMP:20260414T192022Z
LAST-MODIFIED:20211018T205928Z
LOCATION:2103 Chamberlin Hall
SUMMARY:Extremely out-of-equilibrium 1D gases\, Physics Department Col
 loquium\, David Weiss\, Penn State
DESCRIPTION:It is notoriously hard to calculate the out-of-equilibrium
  
\ndynamics of many-body quantum systems. While confining particles t
 o 
\none dimension sometimes simplifies dynamics\, even in 1D\, dynami
 cal 
\nsolutions have usually been elusive. A new approximate theory\,
  
\ngeneralized hydrodynamics (GHD)\, can model previously intractable
  
\ndynamics. But are GHD’s approximations valid? I will describe a 
 series 
\nof experiments with 1D Bose gases taken very far from equili
 brium by\, 
\nfor instance\, making sudden trap changes that lead them
  to compress 
\n35-fold. We study the evolving distribution of rapidit
 ies\, which are the 
\nmomenta of the quasiparticles that emerge in th
 ese many-body systems\, 
\nand which we only recently first experiment
 ally observed for equilibrium 
\n1D gases. These out-of-equilibrium ex
 periments allow us to test the 
\nunderlying assumptions of GHD across
  coupling regimes. As I will show\, 
\nwe find excellent agreement bet
 ween our experiments and GHD theory.
URL:https://www.physics.wisc.edu/events/?id=6469
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