The Laplacian Gauge Gluon Propagator in SU(N_c)

Abstract

We examine the gluon propagator in the Laplacian gauge in quenched lattice QCD as a function of the number of colours. We observe a weak dependence on $N_c$ over the whole momentum range. This implies an almost $N_c$-independent gluon pole mass in units of the string tension.

Comments: 5 pages, 7 figures. A study of the gluon propagator in SU(4) for various lattice sizes was added. Extended version to appear in Phys. Rev. D