Physics - Condensed Matter Seminar

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Condensed Matter Seminar: " Superfluids in the cosmos and on the 4th floor"

Event Type
Physics - Condensed Matter
190 ESB
Dec 7, 2018   1:00 pm  
Gordon Baym, University of Illinois at Urbana-Champaign

In this talk I will discuss how really old favorites of Urbana condensed matter physics are surfacing anew in modern astrophysical and high energy contexts, pushing our understanding of superfluids, and enabling new experiments. Vortices in neutron stars raise tantalizing conceptual questions: in a neutron star, matter goes relatively smoothly from superfluid neutron matter at lower densities to superfluid quark matter at higher densities. Since singly quantized quark matter vortices nominally have three times the circulation of nuclear matter vortices, how smoothly though, in a rotating neutron star, can vortices in nuclear matter connect at the interface of the two phases to vortices in quark matter? Must there be boojums at the interface joining one quark vortex with three neutron vortices? (Spoiler: no!) I will also briefly mention using dilute solutions of He-3 in superfluid He-4 to search for the electric dipole moment of the neutron, and superfluid He-4 to search for dark matter in the MeV mass range.



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