ar X iv : h ep - t h / 04 02 04 3 v 2 1 2 Fe b 20 04 Nonperturbative heat kernel and nonlocal effective action ∗

ar X iv : h ep - t h / 04 02 04 3 v 1 5 F eb 2 00 4 Nonperturbative heat kernel and nonlocal effective action ∗

We present an overview of recent nonperturbative results in the theory of heat kernel and its late time asymptotics responsible for the infrared behavior of quantum effective action for massless theories. In particular, we derive the generalization of the Coleman-Weinberg potential to physical situations when the field is not homogeneous throughout the whole spacetime. This generalization repre...

ar X iv : h ep - p h / 04 02 29 2 v 1 2 7 Fe b 20 04 1 SU ( 3 ) Chiral Effective Field

A personal overview on the present status of SU(3) chiral perturbation theory in the baryonic sector is given. Recent developments are presented and remaining challenges are pointed out.

ar X iv : h ep - p h / 04 02 19 6 v 1 1 8 Fe b 20 04 The 2 - particle irreducible effective action in gauge theories

The goal of this paper is to develop the formalism of the two-particle irreducible (2PI) [1] (or Cornwall Jackiw Tomboulis (CJT) [2]) effective action (EA) in a way appropiate to its application to non equilibrium gauge theories. We hope this review article will stimulate new work into this field.

ar X iv : h ep - p h / 04 02 19 0 v 1 1 8 Fe b 20 04 1 Pentaquarks in the 10 F - and 10 F - plets

ar X iv : h ep - t h / 04 02 14 8 v 1 1 9 Fe b 20 04 Surveillance on the light - front gauge fixing

In this work we propose two Lagrange multipliers with distinct coefficients for the light-front gauge that leads to the complete (non-reduced) propagator. This is accomplished via (n · A) 2 + (∂ · A) 2 terms in the La-grangian density. These lead to a well-defined and exact though Lorentz non invariant light front propagator.