Speaker
Stefan Kühn
(The Cyprus Institute)
Description
We numerically study the Hamiltonian lattice formulation of the Schwinger model with two fermion flavors using matrix product states. Keeping the mass of the first flavor at a fixed positive value, we tune the mass of the second flavor through a range of negative values, thus exploring a regime where conventional Monte Carlo methods suffer from the sign problem. Our results show signatures of a phase transition at the point where the absolute values of both masses are equal. Moreover, we observe the formation of a condensate, thus indicating that the observed transition is the analog of the CP-violating Dashen phase transition in QCD.
