Journal article

Publication year: 2020

Journal: Physical Review D

Volume number: 101

Issue number: 9

ISSN: 2470-0010

eISSN: 2470-0029

Open access status: Hybrid

DOI Link: https://doi.org/10.1103/PhysRevD.101.094010

Publisher: American Physical Society

Abstract: 
We study fermionic excitations in a hot and dense strongly interacting medium consisting of quarks and (pseudo-)scalar mesons. In particular, we use the two-flavor quark-meson model in combination with the functional renormalization group (FRG) approach, which allows to take into account the effects from thermal and quantum fluctuations. The resulting fermionic excitation spectrum is investigated by calculating the quark spectral function at finite temperature, quark chemical potential, and spatial momentum. This involves an analytic continuation from imaginary to real energies by extending the previously introduced analytically continued FRG method to the present case. We identify three different collective excitations in the medium: the ordinary thermal quark, the plasmino mode, and an ultrasoft "phonino" mode. The dispersion relations of these modes are extracted from the quark spectral function. When compared to corresponding results from an FRG-improved one-loop calculation, a remarkable agreement has been found.

Harvard Citation style: Tripolt, R., Rischke, D., von Smekal, L. and Wambach, J. (2020) Fermionic excitations at finite temperature and density, Physical Review D, 101(9), Article 094010. https://doi.org/10.1103/PhysRevD.101.094010

APA Citation style: Tripolt, R., Rischke, D., von Smekal, L., & Wambach, J. (2020). Fermionic excitations at finite temperature and density. Physical Review D. 101(9), Article 094010. https://doi.org/10.1103/PhysRevD.101.094010