Multicritical point of the three-dimensional Z_2 gauge Higgs model

Abstract

We investigate the multicritical behavior of the three-dimensional Z_2 gauge Higgs model, at the multicritical point (MCP) of its phase diagram, where one first-order transition line and two continuous Ising-like transition lines meet. The duality properties of the model determine some features of the multicritical behavior at the MCP located along the self-dual line. Moreover, we argue that the system develops a multicritical XY behavior at the MCP, which is controlled by the stable XY fixed point of the three-dimensional multicritical Landau-Ginzburg-Wilson field theory with two competing scalar fields associated with the continuous Z_2 transition lines meeting at the MCP. This implies an effective enlargement of the symmetry of the multicritical modes at the MCP, to the continuous group O(2). We also provide some numerical results to support the multicritical XY scenario.

arXiv comment10 pages

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