PoS - Proceedings of Science
Volume 311 - Critical Point and Onset of Deconfinement (CPOD2017) - Parallel Session III
Spectral Functions from the Functional Renormalization Group
J. Wambach*, C. Jung, F. Rennecke, R.A. Tripolt and L. von Smekal
Full text: pdf
Pre-published on: January 16, 2018
Published on: January 22, 2018
Abstract
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 $\rho$ and the $a_1$ spectral function as well as the behavior of their pole masses is discussed.
DOI: https://doi.org/10.22323/1.311.0077
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