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SUMMARY:Low-temperature quantum bounds in simple models - Jorge Kurchan\, 
 ENS Paris
DTSTART:20210520T130000Z
DTEND:20210520T140000Z
UID:TALK160021@talks.cam.ac.uk
CONTACT:Edgar Engel
DESCRIPTION:In the past few years there has been considerable activity aro
 und a set of quantum bounds on transport coefficients (viscosity\, conduct
 ivity) and on chaos (Lyapunov exponents)\, relevant at low temperatures. T
 he interest comes from the fact that AdS/CFT Black-Hole models seem to sat
 urate all of them. To fix ideas\, a simple case is that of systems whose l
 owest energy is a degenerate manifold\, rather than a point. Examples are 
 quantum hard-sphere liquids and quantum spin liquids.\nIn this context the
  bounds are approached and are consequences of the uncertainty principle\,
  and one understands the mechanisms whereby quantum  mechanics enforces th
 em. For a system to saturate the bound\, it appears as a necessary conditi
 on that at each temperature there are some degrees of freedom that are sti
 ll classical\, and some are on the\nverge of being affected by quantum eff
 ects.
LOCATION:Details of video conferencing will be distributed nearer the time
 .
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