First order phase transitions in SU(2) gauge theories with many flavours of staggered fermions
1990; Elsevier BV; Volume: 241; Issue: 3 Linguagem: Inglês
10.1016/0370-2693(90)91663-v
ISSN1873-2445
Autores Tópico(s)Markov Chains and Monte Carlo Methods
ResumoAbstract We present a hybrid Monte Carlo study of SU(2) lattice gauge theory coupled to 8 and 12 flavours of staggered fermions. The chiral and deconfinement phase transitions are coincident on 6 4 and 8 4 lattices. For N f = 8 there are large finite size effects suggesting a temperature driven transition induced by the finite size of the system. With this assumption, aT c does not satisfy asymptotic scaling. For 12 flavours, asymptotic freedom is lost and we expect a bulk transition on a sufficiently large lattice; our numerical results for the critical point with N f = 12 show large finite size effects. Evidence for the first order nature of the transitions derives from the observation of tunneling between metastable states.
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