CERN Accelerating science

Report number arXiv:1211.3374 ; CERN-PH-TH-2012-302
Title A surprise with many-flavor staggered fermions in the strong coupling limit
Author(s) de Forcrand, Philippe (Zurich, ETH ; CERN) ; Kim, Seyong (Sejong U.) ; Unger, Wolfgang (Frankfurt U.)
Imprint 15 Nov 2012
Note Comments: 7 pages, 4 figures, Talk presented at The XXXth International Symposium on Lattice Field Theory - Lattice 2012, June 24-29, 2012, Cairns, Australia
In: PoS LATTICE2012 (2012) pp.053
In: 30th International Symposium on Lattice Field Theory, Cairns, Australia, 24 - 29 Jun 2012, pp.053
Subject category Particle Physics - Lattice
Abstract It is widely believed that chiral symmetry is spontaneously broken at zero temperature in the strong coupling limit of staggered fermions, for any number of colors and flavors. Using Monte Carlo simulations, we show that this conventional wisdom, based on a mean-field analysis, is wrong. For sufficiently many fundamental flavors, chiral symmetry is restored via a bulk, first-order transition. This chirally symmetric phase appears to be analytically connected with the expected conformal window of many-flavor continuum QCD. We perform simulations in the chirally symmetric phase at zero quark mass for various system sizes L, and measure the torelon mass and the Dirac spectrum. We find that all observables scale with L, which is hence the only infrared length scale. Thus, the strong-coupling chirally restored phase appears as a convenient laboratory to study IR-conformality. Finally, we present a conjecture for the phase diagram of lattice QCD as a function of the bare coupling and the number of quark flavors.
Copyright/License Preprint: © 2012-2017 CERN (License: CC-BY-3.0)
Publication: (License: CC-BY-NC-SA-3.0)

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