Joint HET/RIKEN/YITP Seminar

"A novel phase in SU(3) gauge theory with many light fermions"

Presented by Anna Hasenfratz, University of Colorado at Boulder

Wednesday, April 18, 2012, 2:00 pm — Small Seminar Room, Bldg. 510

In this talk I will discuss the results of our recent study of the phase structure of SU(3) lattice gauge theory with $N_f = 12$ and 8 staggered fermions in the fundamental representation. For small fermion masses we found two bulk phase transitions at strong gauge couplings. The phase between the two transitions appears to be a novel phase that breaks the single site shift symmetry of staggered fermions. The eigenvalue spectrum of the Dirac operator, the static potential and the meson spectrum collectively establish that this novel phase is confining but chirally symmetric. The phase is bordered by first-order phase transitions, and since we find the same phase structure with $N_f = 8$ fermions, it is most likely that this novel phase is a strong-coupling lattice artifact, the existence of which does not imply IR conformality. (ArXiv:1111:2317)

Hosted by: Christoph Lehner

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