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.

arXiv commentTalk presented at Quark Matter 2014 by RAT

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Cited by in corpus (5)

• The nonperturbative functional renormalization group and its applications
• 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
• Nonperturbative renormalization-group approach preserving the momentum dependence of correlation functions
• Physics-informed operator flows and observables