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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)

- Aleksandar Kocić
- 1992

The interplay of spectroscopy, scaling laws and critical indices is studied in strongly coupled quenched QED. Interpreted as a model of technicolor having strong interactions at short distances, we predict the techni-meson mass spectrum in a simplified model of a dynamically generated top quark mass Mf . Our results support the strict inequality that the… (More)

Four-fermi models in dimensionality 2 < d < 4 exhibit an ultra-violet stable renormalization group fixed point at a strong value of the coupling constant where chiral symmetry is spontaneously broken. The resulting field theory describes relativistic fermions interacting non-trivially via exchange of scalar bound states. We calculate the O(1/Nf )… (More)

- Aleksandar Kocić
- 1993

We argue that theories with fundamental fermions which undergo chiral symmetry breaking have several universal features which are qualitatively different than those of theories with fundamental scalars. Several bounds on the critical indices δ and η follow. We observe that in four dimensions the logarithmic scaling violations enter into the Equation of… (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)

- S TASSOVATZ, B Tassovatz, Aleksandar Kocić
- Minerva medica
- 1959

- Aleksandar Kocić
- 1993

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)

- Aleksandar Kocić
- 1995

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 discuss chiral symmetry breaking critical points from the perspective of PCAC, correlation length scaling and the chiral equation of state. A scaling theory for the ratio Rπ of the pion to sigma masses is presented. The Goldstone character of the pion and properties of the longitudinal and transverse chiral susceptibilities determine the ratio Rπ which… (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)

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