Spectral Functions from the Functional Renormalization Group

Abstract

In this article we wish to present a new method to obtain spectral functions at finite temperature and density from the Functional Renormalization Group (FRG). The FRG offers a powerful non-perturbative tool to deal with phase transitions in strong-interaction matter under extreme conditions and their fluctuation properties. Based on a thermodynamically consistent truncation we derive flow equations for pertinent two-point functions in Minkowski space-time. We demonstrate the feasibility of the method by calculating mesonic spectral functions in hot and dense hadronic matter using the quark-meson model as a simple example.

Comments: 18 pages, 6 figures, 2 tables. Talk presented at "45 years of nuclear theory at Stony Brook - A tribute to Gerald E. Brown"