Lattice QCD with 8 and 12 degenerate quark flavors
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We compare extensive simulations of QCD with 8 and 12 flavors of degenerate quarks, using the DBW2 gauge action, naive staggered fermions, and the rational hybrid Monte Carlo algorithm. A variety of values of the coupling constant, quark mass, and lattice size have been used. Our data suggests that, as the bare coupling is decreased, a rapid cross-over, which dramatically changes the lattice scale, exists with both 8 and 12 flavors. The scale change across this cross-over is much larger with 12 flavors than it is with 8 flavors. All of the observables we have measured, in both the zero and finite temperature systems, are consistent with a chiral symmetry breaking phase for the zero temperature theory on the weak coupling side of the rapid cross-over.
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Forward citations
Cited by 3 Pith papers
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The Roberge-Weiss transition as a probe for conformality in many-flavor QCD
For eight-flavor QCD the Roberge-Weiss transition temperature vanishes in the chiral limit, placing the theory inside the conformal window.
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Zeros of the partition function for 12 flavor QCD
Numerical evidence from partition function zeros supports a first-order phase transition line in 12-flavor QCD ending at a second-order critical point near bare quark mass 0.05.
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Zeros of the partition function for 12 flavor QCD
Numerical study of partition function zeros in 12-flavor lattice QCD finds strong evidence for first-order transitions at m_q=0.02 with scaling d=3.98(6) and suggests critical mass m_q^c approximately 0.05 where the t...
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