ar X iv : h ep - t h / 94 06 03 3 v 1 6 J un 1 99 4 Parity Violation in the Three Dimensional Thirring Model

ar X iv : h ep - t h / 99 06 02 9 v 1 3 J un 1 99 9

ar X iv : h ep - t h / 98 03 07 9 v 1 1 0 M ar 1 99 8 Causal Theory for the Gauged Thirring Model

We consider the (2 + 1)-dimensional massive Thirring model as a gauge theory, with one fermion flavor, in the framework of the causal perturbation theory and address the problem of dynamical mass generation for the gauge boson. In this context we get an unambiguous expression for the coefficient of the induced Chern-Simons term.

ar X iv : h ep - p h / 94 03 31 6 v 1 1 8 M ar 1 99 4 Large tanβ from SU ( 2 ) R Gauge Symmetry

Sufficient conditions for the relation tanβ ≃ m t /m b to hold in supersym-metric grand unified theories are formulated. Essential ingredients are the SU(2) R gauge symmetry and a discrete matter parity. The applicability of our conditions is illustrated by specific examples. Implications for neutrino masses are discussed.

X iv : h ep - t h / 93 03 08 6 v 1 1 5 M ar 1 99 3 Zero - curvature condition in two dimensions . Relativistic particle models and finite W - transformations

A relation between an Sp(2M) gauge particle model and the zero-curvature condition in a two-dimensional gauge theory is presented. For the Sp(4) case we construct finite W-transformations.

ar X iv : h ep - p h / 94 06 23 4 v 1 6 J un 1 99 4 QUANTUM SCATTERING AND CLASSICAL SOLUTIONS ∗ Stephen

I discuss a formalism for computing quantum scattering amplitudes using a semiclassical expansion of a functional integral representation for the S-matrix. The classical background for the expansion is determined by solving the equations of motion subject to nontrivial boundary conditions determined by the initial and final quantum states. The formalism is designed to accomodate intrinsically n...