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Institute for Condensed Matter Theory Seminar: "Planckian bounds, long range correlations, and a universal viscosity collapse"

Event Type
Seminar/Symposium
Sponsor
The Physics Department & The Institute for Condensed Matter Theory
Virtual
wifi event
Date
Feb 15, 2021   12:00 pm  
Speaker
Zohar Nussinov, Washington University in St. Louis
Views
61
Originating Calendar
Physics - The Anthony J Leggett Institute for Condensed Matter Theory Seminar

We will derive thermalization bounds for open and closed systems. For open systems, we will find that thermalization times cannot, typically, be shorter than Planck’s constant divided by the temperature; a more general (and accurate) relation involving the heat capacities will be explained. For closed systems, the inequalities that we will obtain suggest that non-adiabatically driven systems may display long range correlations. We will explain how these long range correlations appear in certain soluble models in general spatial dimensions and relate these correlations to the geometry of state manifolds. We will describe how experimental measurements of equilibrated systems may be used to infer the properties of eigenstates of many body Hamiltonians (and further discuss a similar, purely classical, analysis). We will then piece these results together to predict the viscosity and relaxation times of supercooled liquids and glasses. These predictions will be compared to the viscosities and dielectric response times of glass formers of all known types. The comparison shows that the viscosities/relaxation times of all known supercooled liquids collapse onto a universal curve with only one (nearly constant) liquid dependent parameter over 16 decades. The collapsed universal curve is that predicted by the theory.

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