Abstract
SU(2) and SU(3) lattice gauge theories are simulated by molecular dynamics methods with Nf=8 and 12 flavors of light quarks on lattices of sizes 44, 64 and 84. On the small lattices, 44 and 64, the microcanonical algorithm generates van der Waals S-shaped curves for the observables 〈ΨΨ〉, the average plaquette and the Wilson line indicating the presence of first-order phase transitions. On the 84 lattice a transition in the chiral order parameter 〈ΨΨ〉 occurs at a coupling distinct from the coupling where the Wilson line departs from zero. This suggests that these theories have a bulk, zero temperature chiral-restoring transition in addition to a rich finite temperature phase structure.
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