BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Eric Mefford (École Polytechnique Paris) DTSTART:20200505T150000Z DTEND:20200505T160000Z DTSTAMP:20260423T022921Z UID:HoloTube/3 DESCRIPTION:Title: Transport in clean quantum critical superfluids\nby Eric Mefford (Éc ole Polytechnique Paris) as part of HoloTube: Applied holography webinars\ n\n\nAbstract\nThe hydrodynamic regime of superfluids in systems like 4He has been well understood since the seminal work of Landau and Tisza. A fun damental assumption in much subsequent work is the low-temperature dominan ce of the superfluid phonon which leads to universal behavior in transport that is characterized by the phonon sound speed. I will discuss investiga tions of the two-fluid model of superfluids near an underlying quantum cri tical phase and establish criteria for the breakdown of this assumption wh ich leads to novel transport behavior. A surprising result is the non-vani shing of the charge density of the fluid’s normal component at zero temp erature. I will illustrate these results with some holographic models.\n LOCATION:https://researchseminars.org/talk/HoloTube/3/ END:VEVENT END:VCALENDAR