Monte Carlo simulations of the CP^3 model and U(1) gauge theory in the presence of a theta-term

Abstract

A theta-term, which couples to topological charge, is added to the two-dimensional lattice CP^3 model and U(1) gauge theory. Monte Carlo simulations are performed and compared to strong-coupling character expansions. In certain instances, a flattening behavior occurs in the free-energy at sufficiently large theta, but the effect is an artifact of the simulation methods.

Comments: 3 pages, Latex, 4 figures, Contribution to LATTICE 97, Edinburgh, UK, 22-26 July 1997