Colloquium Schedule

Colloquium: Thursday, October 18th, 4:10 PM, Lewis Lab 316

Scale Invariant Strongly Interacting Fermi Gases

John E. Thomas

North Carolina State University

Optically-trapped, ultra-cold gases of spin ½-up and spin ½- down 6Li atoms model high temperature superconductors, neutron matter, and even the hydrodynamics of a quarkgluon plasma, a state of matter at 2 trillion degrees that existed microseconds after the Big Bang. A bias magnetic field tunes the gas to a collisional (Feshbach) resonance, where the dilute atomic cloud becomes a scale-invariant, stronglyinteracting fluid: Shock waves are produced when two clouds collide. Remarkably, the ratio of the shear viscosity to the entropy density of such clouds is comparable to that of a quark-gluon plasma, close to the minimum ratio conjectured for a “perfect fluid” using scale-invariant conformal field theory methods. I will describe our recent observations of scale-invariant expansion, our latest results on quantum shear viscosity, and preliminary data on hydrodynamic flow from an optical box potential into a channel.

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Physics and Astronomy Colloquia are usually scheduled for Thursdays at 4:10 PM in Lewis Lab room 316. Refreshments and snacks are available in the nearby coffee room at 3:45 PM.


Physics Colloquium Schedule for FALL 2018

Click on Title below for past or upcoming Announcements (where available), and Speaker name for website.        

August 30Rajarshi RoyUniv. of MarylandRandom Numbers from Light: Photons, Chaos and Entropy
September 6Markus LutyUC DavisMapping the Landscape of Quantum Field Theories
September 13Rosi ReedLehigh Univ.The STAR Event Plane Detector
September 20Lee BassettU PennThe Power of Imperfection: Embracing the Quantum Limit in Semiconductor Devices
September 27Ryan PensackBoise State Univ.Singlet Exciton Fission: Toward Molecular Packing Guidelines for Efficient Triplet Harvesting
October 4Steven GubserPrinceton Univ.Number Theory and Spacetime
October 11Robert AustinPrinceton Univ.The Physics of Cancer
October 18John ThomasN. Carolina StateScale Invariant Strongly Interacting Fermi Gases
October 25Oana JurchescuWake Forest U.Every Molecule Counts: From Single Crystals to Large Area Organic Flexible Electronics
November 1Feyman Symp.--
November 8---
November 15Christopher PopeTexas A&M-
November 22No ColloquiumHappy Thanksgiving-
November 29Taviare HawkinsU. WisconsinThe Mechanics of Microtubules
December 6François NedelecEMBL HeidelbergActive Contraction or Expansion of Disordered Cytoskeletal Networks
December 11---