Effective Lagrangians and Chiral Random Matrix Theory

TL;DR

This paper demonstrates how effective Lagrangians for different color representations can be derived directly from chiral random matrix theories, extending previous results to two colors and arbitrary adjoint representations.

Contribution

It constructs the effective theory from random matrix models for two colors in the fundamental representation and for arbitrary colors in the adjoint, including a fermionic partition function for Majorana fermions.

Findings

Derived sum rules for inverse Dirac eigenvalues from effective Lagrangian and random matrix theory.

Extended the construction of effective theories to two-color fundamental and arbitrary adjoint representations.

Formulated a fermionic partition function for Majorana fermions with a specific reality condition.

Abstract

Recently, sum rules were derived for the inverse eigenvalues of the Dirac operator. They were obtained in two different ways: i) starting from the low-energy effective Lagrangian and ii) starting from a random matrix theory with the symmetries of the Dirac operator. This suggests that the effective theory can be obtained directly from the random matrix theory. Previously, this was shown for three or more colors with fundamental fermions. In this paper we construct the effective theory from a random matrix theory for two colors in the fundamental representation and for an arbitrary number of colors in the adjoint representation. We construct a fermionic partition function for Majorana fermions in Euclidean space time. Their reality condition is formulated in terms of complex conjugation of the second kind.