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Two-dimensional O(3) model at nonzero density: From dual lattice simulations to repulsive bosons

Bruckmann, Falk ; Gattringer, Christof ; Kloiber, Thomas ; Sulejmanpasic, Tin


We discuss the thermodynamics of the O(3) nonlinear sigma model in 1 + 1 dimensions at nonzero chemical potential (equivalent to a magnetic field). In its conventional field theory representation the model suffers from a sign problem. By dualizing the model, we are able to fully access the nonzero density regime of an asymptotically free theory with dynamical mass gap at arbitrary chemical ...


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