Spectral functions from the functional renormalization group at finite temperature and density

Abstract

We present a viable method to obtain real-time quantities such as spectral functions or transport coefficients at finite temperature and density within a non-perturbative Functional Renormalization Group approach. Our method is based on a thermodynamically consistent truncation of the flow equations for 2-point functions with analytically continued frequency components in the originally Euclidean external momenta. We demonstrate its feasibility by calculating the mesonic spectral functions in the quark-meson model at different temperatures and quark chemical potentials, in particular around the critical endpoint in the phase diagram of the model.

Talk presented at Quark Matter 2014 by RAT

References in corpus (5)

• Exact evolution equation for the effective potential
• Renormalization Group Approach towards the QCD Phase Diagram
• Fluctuations in the quark-meson model for QCD with isospin chemical potential
• Quark spectral properties above Tc from Dyson-Schwinger equations
• Extraction of Spectral Functions from Dyson-Schwinger Studies via the Maximum Entropy Method

Cited by in corpus (2)

• Functional renormalization group studies of nuclear and neutron matter
• Nonperturbative functional renormalization-group approach to transport in the vicinity of a $(2+1)$-dimensional O($N$)-symmetric quantum critical point