Abstract
The author analyzes glueball contributions and torelon contributions (flux loops encircling the toroidal boundary conditions) to various lattice observables. At smaller lattice sizes, torelons rather than glueballs dominate and one can obtain a quantitative understanding of the finite-size effects on the average plaquette energy. He argues that these torelon contributions can also give large finite-size effects in adjoint loop correlations, which have recently been proposed as an efficient window on glueballs. He presents a method that can yield a lower limit on the glueball mass, in contrast to the upper mass limits obtained hitherto.