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SUMMARY:William Witczak-Krempa (University of Montreal)
DTSTART:20210322T183000Z
DTEND:20210322T193000Z
DTSTAMP:20260423T023931Z
UID:Kadanoff/32
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/Kadanoff/32/
 ">Cornering the universal shape of fluctuations and entanglement</a>\nby W
 illiam Witczak-Krempa (University of Montreal) as part of Kadanoff seminar
 s\n\n\nAbstract\nUnderstanding the fluctuations of observables is one of t
 he main goals in physics. We investigate such fluctuations when a subregio
 n of the full system can be observed\, focusing on geometries with corners
 . We report that the dependence on the opening angle is super-universal: u
 p to a numerical prefactor\, this function does not depend on anything\, p
 rovided the system under study is uniform\, isotropic\, and correlations d
 o not decay too slowly. The prefactor contains important physical informat
 ion: we show in particular that it gives access to the long-wavelength lim
 it of the structure factor. We illustrate our findings with several exampl
 es: classical fluids\, fractional quantum Hall (FQH) states\, scale invari
 ant quantum critical theories\, and metals. Finally\, we discuss connectio
 ns with the entanglement entropy\, including new results for Laughlin FQH 
 states. Ref: arXiv:2102.06223\n
LOCATION:https://researchseminars.org/talk/Kadanoff/32/
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