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arXiv · 1311.0630

Spectral Functions for the Quark-Meson Model Phase Diagram from the Functional Renormalization Group

Ralf-Arno Tripolt·Nils Strodthoff·Lorenz von Smekal·Jochen Wambach
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Abstract

We present a method to obtain spectral functions at finite temperature and density from the Functional Renormalization Group. 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. For the uniqueness of this continuation at finite temperature we furthermore implement the physical Baym-Mermin boundary conditions. We demonstrate the feasibility of the method by calculating the mesonic spectral functions in the quark-meson model along the temperature axis of the phase diagram, and at finite quark chemical potential along the fixed-temperature line that crosses the critical endpoint of the model.

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Ralf-Arno Tripolt, Nils Strodthoff, Lorenz von Smekal, Jochen Wambach. 2013-11-04. Spectral Functions for the Quark-Meson Model Phase Diagram from the Functional Renormalization Group. https://doi.org/10.1103/physrevd.89.034010

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