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In this paper, we discuss the vacuum structure of QCD with two flavors of Wilson fermions, inside the Aoki phase. We provide numerical evidence, coming from HMC simulations in 4 4 , 6 4 and 8 4 lattices, supporting a vacuum structure for this model at strong coupling more complex than the one assumed in the standard wisdom, with new vacua where the expectation value of iψ¯γ5ψ...
We analyze the vacuum structure of a generalized lattice Nambu–Jona-Lasinio model with two flavors of Wilson fermions, such that its continuum action is the most general four-fermion action with “trivial” color interactions, and having a SU(2)V×SU(2)A symmetry in the chiral limit. The phase structure of this model in the space of the two four-fermion couplings shows, in addition to the standard Aoki...
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