Infrared behavior of the gluon propagator in lattice Landau gauge: the three-dimensional case

Abstract

We evaluate numerically the three-momentum-space gluon propagator in the lattice Landau gauge, for three-dimensional pure-SU(2) lattice gauge theory with periodic boundary conditions. Simulations are done for nine different values of the coupling $\beta$, from $\beta =0$ (strong coupling) to $\beta =6.0$ (in the scaling region), and for lattice sizes up to $V=64^3$. In the limit of large lattice volume we observe, in all cases, a gluon propagator decreasing for momenta smaller than a constant value $p_{dec}$. From our data we estimate $p_{dec}\approx 350$ MeV. The result of a gluon propagator decreasing in the infrared limit has a straightforward interpretation as resulting from the proximity of the so-called first Gribov horizon in the infrared directions.

14 pages, BI-TP 99/03 preprint, correction in the Acknowledgments section. To appear in Phys.Rev.D

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