Critical acceleration of Monte-Carlo simulations of Z2 gauge theory

Critical Slowing Down for Z2 lattice gauge theory in 3 dimensions is reduced drastically by a stochastic cluster algorithm. It reduces the dynamical exponent from z > 2 (standard local algorithms) to z ≅ 0.73. The Monte-Carlo pseudodynamics acts on the gauge invariant flux tubes that are known to be the relevant large-scale low-energy excitations. A comparison of our results with known results for the 3-D Ising model and Φ4 model supports the conjecture of universality classes for stochastic cluster algorithms. (orig.)