SU(2)Landau gluon propagator on a1403lattice

We present a numerical study of the gluon propagator in the lattice Landau gauge for three-dimensional pure $\mathrm{SU}\left(2\right)\mathrm{}$ lattice gauge theory at couplings $\beta =4.2,$ 5.0, 6.0 and for lattice volumes ${V=40\mathrm{}}^3,$ ${80}^3,$ ${140}^3.$ In the limit of large $V$ we observe a decreasing gluon propagator for momenta smaller than $p_{\mathrm{dec}}{=350\mathrm{}}_{-50}^{+100\mathrm{}}\mathrm{MeV}.$ Data are well fitted by Gribov-like formulas and seem to indicate an infrared critical exponent κ slightly above 0.6, in agreement with recent analytic results.