Scaling of gauge balls and static potential in the confinement phase of the pure U(1) lattice gauge theory

Abstract

We investigate the scaling behaviour of gauge-ball masses and static potential in the pure U(1) lattice gauge theory on toroidal lattices. An extended gauge field action $-{\sum }_P(\beta \cos {\Theta }_P+\gamma \cos 2{\Theta }_P)$ is used with $\gamma =-0.2$ and -0.5. Gauge-ball correlation functions with all possible lattice quantum numbers are calculated. Most gauge-ball masses scale with the non-Gaussian exponent ${\nu }_{ng}\approx 0.36$. The $A_1^{++}$ gauge-ball mass scales with the Gaussian value ${\nu }_g\approx 0.5$ in the investigated range of correlation lengths. The static potential is examined with Sommer's method. The long range part scales consistently with ${\nu }_{ng}$ but the short range part tends to yield smaller values of $\nu$. The $\beta$-function, having a UV stable zero, is obtained from the running coupling. These results hold for both $\gamma$ values, supporting universality. Consequences for the continuum limit of the theory are discussed.

Comments: Contribution to the Lattice 97 proceedings, LaTeX, 3 pages, 3 figures