Abstract
We find a strong-to-weak coupling crossover in lattice gauge theories that appears to become a third-order phase transition at , in a similar way to the Gross-Witten transition in the lattice gauge theory. There is, in addition, a peak in the specific heat at approximately the same coupling that increases with , which is connected to monopoles (instantons), reminiscent of the first-order bulk transition that occurs in lattice gauge theories for . Our calculations are not precise enough to determine whether this peak is due to a second-order phase transition at or to the third-order phase transition having a critical behavior different to that of the Gross-Witten transition. We show that as the lattice spacing is reduced, the gauge theory on a finite 3-torus appears to undergo a sequence of first-order symmetry breaking transitions associated with each of the tori (ordered by size). We discuss how these transitions can be understood in terms of a sequence of deconfining transitions on ever-more dimensionally reduced gauge theories. We investigate whether the trace of the Wilson loop has a nonanalyticity in the coupling at some critical area, but find no evidence for this. However we do find that, just as one can prove occurs in , the eigenvalue density of a Wilson loop forms a gap at at a critical value of its trace. We show that this gap formation is in fact a corollary of a remarkable similarity between the eigenvalue spectra of Wilson loops in and (and indeed ): for the same value of the trace, the eigenvalue spectra are nearly identical. This holds for finite as well as infinite ; irrespective of the Wilson loop size in lattice units; and for Polyakov as well as Wilson loops.
6 More- Received 17 November 2006
DOI:https://doi.org/10.1103/PhysRevD.74.125010
©2006 American Physical Society