MORE ON THE SU(2) DECONFINEMENT TRANSITION IN THE MIXED ACTION

We examine certain issues related to the universality of the SU(2) lat tice gauge theory at nonzero temperatures. Using Monte Carlo simulatio ns and strong coupling expansions, we study the behavior of the deconf inement transition in an extended coupling plane (beta,beta(A)) around the tricritical Feint where the deconfinement transition changes from second to first order. Our numerical results On N-tau = 2,4,6,8 latti ces show that the tricritical point first moves down towards the Wilso n a is and then moves slowly upwards, if at all, as the lattice spacin g is reduced. Lattices with very large N-tau seem to be, therefore, ne cessary for the mixed action to exhibit the critical exponents of the three-dimensional Ising model for positive values of the adjoint coupl ing.