Non-Abelian gauged Nambu-Jona-Lasinio models on the lattice

Simon Catterall, Richard Galvez, Jay Hubisz, Dhagash Mehta, Aarti Veernala

Research output: Contribution to journalArticle

10 Scopus citations

Abstract

We use Monte Carlo simulation to probe the phase structure of a SU(2) gauge theory containing N f Dirac fermion flavors transforming in the fundamental representation of the group and interacting through an additional four-fermion term. Pairs of physical flavors are implemented using the two tastes present in a reduced staggered fermion formulation of the theory. The resultant lattice theory is invariant under a set of shift symmetries which correspond to a discrete subgroup of the continuum chiral-flavor symmetry. The pseudoreal character of the representation guarantees that the theory has no sign problem. For the case of N f=4 we observe a crossover in the behavior of the chiral condensate for strong four-fermi coupling associated with the generation of a dynamical mass for the fermions. At weak gauge coupling this crossover is consistent with the usual continuous phase transition seen in the pure (ungauged) Nambu-Jona-Lasinio model. However, if the gauge coupling is strong enough to cause confinement, we observe a much more rapid crossover in the chiral condensate consistent with a first order phase transition.

Original languageEnglish (US)
Article number034502
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume86
Issue number3
DOIs
StatePublished - Aug 13 2012

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

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