Elucidating the Vacuum Structure of the Aoki Phase

الأصل · EN

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 4⁴, 6⁴ and 8⁴ 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 iψγ₅ψ can take non-zero values, and which can not be connected with the Aoki vacua by parity-flavour symmetry transformations.