Noncompact Gauge-Invariant Simulations of U(1), SU(2), and SU(3)

Details Noncompact Gauge-Invariant Simulations of U(1), SU(2), and SU(3) Noncompact Gauge-Invariant Simulations of U(1), SU(2), and SU(3)

1994-12-31

arxiv.org/abs/hep-lat/9412113v2

Nucl.Phys.Proc.Suppl. 42 (1995) 858-860

Physics

High Energy Physics

High Energy Physics - Lattice

For U(1), we switched from beta = 2 / g^2 to beta = 1 / g^2; 3 pages; latex and espcrc2.sty; one figure generated by PiCTeX; o

Scientific paper

10.1016/0920-5632(95)00403-V

We have applied a new gauge-invariant, noncompact, Monte Carlo method to simulate the $U(1)$, $SU(2)$, and $SU(3)$ gauge theories on $8^4$ and $12^4$ lattices. The Creutz ratios of the Wilson loops agree with the exact results for $U(1)$ for $\beta \ge 0.5$ apart from a renormalization of the charge. The $SU(2)$ and $SU(3)$ Creutz ratios robustly display quark confinement at $\beta = 0.5$ and $\beta = 2$, respectively. At much weaker coupling, the $SU(2)$ and $SU(3)$ Creutz ratios agree with perturbation theory after a renormalization of the coupling constant. For $SU(3)$ the scaling window is near $ \beta = 2 $, and the relation between the string tension $\sigma $ and our lattice QCD parameter $ \Lambda_L $ is $\sqrt{\sigma} \approx 5 \Lambda_L$.

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