出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We investigate Nc = 2 gauge theories with adjoint fermions. Motivated by simulations with dynamical overlap fermions, we adopt two flavors of the Wilson-Dirac fermions together with twisted mass ghosts, that setup corresponds to the topology fixing term in the overlap simulations. In this paper we focus on the adjoint representation of Wilson fermion with the Iwasaki gauge action on a 83 ×16 lattice, and explore the Aoki phase structure in the b -M0 plane. We observe the first order phase transition at b = 0.8–1.0 by increasing the bare quark mass (with negative sign convention) from the physical quark mass region. This first order transition seems to disappear at b = 1.2. We also investigate the phase structure around the ‘second finger’ of the Aoki phase so as to search for the range at which the overlap fermion is simulated with locality.
