We present results for in-medium spectral functions obtained within the Functional Renormalization Group framework. The analytic continuation from imaginary to real time is performed in a well-defined way on the level of the flow equations. Based on this recently developed method, results for the sigma and the pion spectral function for the quark-meson model are shown at finite temperature, finite quark-chemical potential and finite spatial momentum. It is shown how these spectral function become degenreate at high temperatures due to the restoration of chiral symmetry. In addition, results for vector- and axial-vector meson spectral functions are shown using a gauged linear sigma model with quarks. The degeneration of the ρ and the a1 spectral function as well as the behavior of their pole masses is discussed.
@article{arxiv.1712.02093,
title = {Spectral Functions from the Functional Renormalization Group},
author = {Jochen Wambach and Christopher Jung and Fabian Rennecke and Ralf-Arno Tripolt and Lorenz von Smekal},
journal= {arXiv preprint arXiv:1712.02093},
year = {2017}
}