  We investigate the phase structure of lattice QCD with dynamical Wilson
fermions. Wilson chiral perturbation theory predicts that the Aoki phase and
the Sharpe-Singleton scenario manifest themselves in very distinct behavior of
the Wilson Dirac eigenvalue spectrum. To test this prediction we perform a
direct calculation of the eigenvalues of the non-Hermitian Wilson Dirac
operator in dynamical lattice simulations. Moreover, we demonstrate an
unexpected quark mass dependence on the shape of the eigenvalue distribution in
the positive quark mass side.

High Energy Physics - Lattice