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SUMMARY:Thermalization bounds and a universal collapse of the viscosities 
 of glass forming liquids - Zohar Nussinov (Oxford\, Sorbonne\, Washington 
 U)
DTSTART:20230216T140000Z
DTEND:20230216T150000Z
UID:TALK192278@talks.cam.ac.uk
CONTACT:Jan Behrends
DESCRIPTION:We will derive bounds on the equilibration times in open and c
 losed systems. For open systems\, we will find that thermalization times c
 annot\, typically\, be shorter than Planck's constant divided by the tempe
 rature\; a more general (and accurate) relation involving the heat capacit
 ies will be explained. For closed systems\, the inequalities that we will 
 obtain suggest that non-adiabatically driven systems may display long rang
 e correlations. We will explain how such long range correlations appear in
  certain soluble models and review how experimental measurements of equili
 brated systems may be used to infer the average properties of eigenstates 
 of many body Hamiltonians. We will then piece these results together to pr
 edict the viscosity and relaxation times of supercooled liquids and glasse
 s. These predictions will be compared to the viscosities and dielectric re
 laxation times of glass formers of all known types. The comparison shows t
 hat the viscosities/relaxation times of all known supercooled liquids coll
 apse onto a universal curve  over 16 decades. The collapsed form predicted
  by theory has only one (nearly constant) liquid dependent parameter.
LOCATION:TCM Seminar Room
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