Aleksandar Kocić

Learn More
Non-compact lattice QED with two flavors of light dynamical quarks is simulated on 16 lattices, and the chiral condensate, monopole density and susceptibility and the meson masses are measured. Data from relatively high statistics runs at relatively small bare fermion masses of 0.005, 0.01, 0.02 and 0.03 (lattice units) are presented. Three independent(More)
Finite size scaling studies of monopole condensation in noncompact quenched lattice QED indicate an authentic second order phase transition lying in the universality class of four dimensional percolation. Since the upper critical dimension of percolation is six, the measured critical indices are far from mean-field values. We propose a simple set of ratios(More)
I give a review and progress report on studies of lattice QED. I emphasize analytical results and methods that are applied in data analysis. Also, I derive some bounds for the critical exponents and establish their connection with scaling violations. Triviality, as realized in φ theory, is ruled out on theoretical grounds. I show that the present data, if(More)
In a recent Letter we discussed the fact that large-N expansions and computer simulations indicate that the universality class of the finite temperature chiral symmetry restoration transition in the 3D Gross-Neveu model is mean field theory. This was seen to be a counterexample to the standard ’sigma model’ scenario which predicts the 2D Ising model(More)
We study the critical region of lattice QED4 in the quenched approximation. The issue of triviality is addressed by contrasting simulation results for < ψ̄ψ > and for the susceptibilities with the predictions of two critical scenarios – powerlaw scaling, and triviality à la Nambu–Jona Lasinio. We discriminate among the two possibilities with reasonable(More)
  • 1