Geometrical Origin of Tricritical Points of various U(1) Lattice Models

TL;DR

This paper explores the geometric origins of phase transition types in U(1) lattice models, revealing discrepancies between theoretical predictions and numerical results, and explaining transition crossover via geometrical object weights.

Contribution

It provides a geometric framework to understand the transition order crossover in U(1) lattice models, challenging existing theoretical predictions.

Findings

Numerical simulations show continuous transitions in 3D U(1) models contrary to predictions.

Geometrical object weights explain the transition crossover from first-order to continuous.

Strong-coupling expansion offers semi-quantitative understanding of phase behavior.

Abstract

We review the dual relationship between various compact U(1) lattice models and Abelian Higgs models, the latter being the disorder field theories of line-like topological excitations in the systems. We point out that the predicted first-order transitions in the Abelian Higgs models (Coleman-Weinberg mechanism) are, in three dimensions, in contradiction with direct numerical investigations in the compact U(1) formulation since these yield continuous transitions in the major part of the phase diagram. In four dimensions, there are indications from Monte Carlo data for a similar situation. Concentrating on the strong-coupling expansion in terms of geometrical objects, surfaces or lines, with certain statistical weights, we present semi-quantitative arguments explaining the observed cross-over from first-order to continuous transitions by the balance between the lowest two weights (``2:1 ratio'') of these geometrical objects.