Friday, March 27, 2009, 2:00 pm — Small Seminar Room, Bldg. 510

I will discuss the way QCD behaves at zero temperature and nonzero density in its large-N limit. I will first present, and resolve, certain subtle confusions in the literature and show that while quarks are not back-reacting on the gauge fields at large-N, they are certainly not "quenched" in any sense. I will then describe a recent calculation in which the large-N ground state of two-dimensional QCD was found for arbitrary values of the baryon number, volume, quark mass and lattice spacing. I will discuss the resulting phase diagram that contains a helical crystal of baryons. If time allows I will remark on the implications of this phase diagram on the validity of lattice studies that rely on "Eguchi-Kawai" volume independence, and on the properties of the QCD "sign problem".

Hosted by: Gregory Soyez

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