/ 04 02 08 9 v 1 1 2 Fe b 20 04 Progress in study of N = 4 SYM effective action
نویسنده
چکیده
We review the basic results concerning the structure of effective action in N = 4 supersymmetric Yang-Mills theory in Coulomb phase. Various classical formulations of this theory are considered. We show that the low-energy effective action depending on all fileds of N = 4 vector multiplet can be exactly found. This result is discussed on the base of algebraic analysis exploring the general harmonic superspace techniques and on the base of straightforward quantum field theory calculations using the N = 2 supersymmetric background field method. We study the one-loop effective action beyond leading low-energy approximation and construct supersymmetric generalization of Heisenberg-Euler-Schwinger effective action depending on all fields of N = 4 vector multiplet. We also consider the derivation of leading low-enrgy effective action at two loops.
منابع مشابه
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.
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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.
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