Three-dimensional monopole-free CP(N-1) models

Abstract

We investigate the phase diagram, and the nature of the phase transitions, of three-dimensional monopole-free CP(N-1) models, characterized by a global U(N) symmetry and a U(1) gauge symmetry, and the absence of monopoles. We present numerical analyses based on Monte Carlo simulations for N=2,4,10,15, and 25. We observe a finite-temperature transition in all cases, related to the condensation of a local gauge-invariant order parameter. For N=2 we are unable to draw any definite conclusion on the nature of the transition. The results may be interpreted by either a very weak first-order transition or a continuous transition with anomalously large scaling corrections. However, the results allow us to exclude that the system develops the critical behavior of the O(3) vector universality class, as it occurs in the standard three-dimensional CP(1) model without monopole suppression. For N=4,10,15, the transition is of first order, and significantly weaker than that observed in the presence of monopoles. For N=25 the results are consistent with a conventional continuous transition. We compare our results with the existing literature and with the predictions of different field-theory approaches. Our results are consistent with the scenario in which the model undergoes continuous transitions for large values of N, in agreement with analytic large-N calculations.

13 pages

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