New proposal for numerical simulations of theta-vacuum like systems
Vicente Azcoiti, Giuseppe Di Carlo, Angelo Galante, Victor Laliena
Abstract
We propose a new approach to perform numerical simulations of theta-vacuum like systems, test it in two analytically solvable models, and apply it to CP3. The main new ingredient in our approach is the method used to compute the probability distribution function of the topological charge at theta=0. We do not get unphysical phase transitions (flattening behavior of the free energy density) and reproduce the exact analytical results for the order parameter in the whole theta-range within a few percent.
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