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The finite temperature ground state energy of the confining string in three-dimensional U(1) gauge theory (2503.05354v1)

Published 7 Mar 2025 in hep-lat and hep-th

Abstract: The three-dimensional U(1) gauge theory displays a peculiar form of confinement which does not fit in the standard paradigm of effective string theory. In this work, we report results of numerical computations of the ground state energy of the confining string in the lattice theory at finite temperature, which we compared with various theoretical predictions. We find markedly different behavior compared to non-Abelian theories. For small values of the bare coupling, far from the continuum, the results are well-described by the Nambu-Goto string. In an intermediate region, all known theoretical predictions are incompatible with the numerical data. For large bare coupling, close to the continuum, we find remarkable agreement with a formula recently derived by Aharony, Barel and Sheaffer.

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