In-medium spectral functions of vector- and axial-vector mesons from the functional renormalization group

• Verfasst von: Jung, Christopher [VerfasserIn]
• Verfasst von: Rennecke, Fabian [VerfasserIn]
• Titel: In-medium spectral functions of vector- and axial-vector mesons from the functional renormalization group
• Verf.angabe: Christopher Jung, Fabian Rennecke, Ralf-Arno Tripolt, Lorenz von Smekal, and Jochen Wambach
• E-Jahr: 2017
• Jahr: 23 February 2017
• Fussnoten: Gesehen am 10.08.2018
• Titel Quelle: Enthalten in: Physical review
• Ort Quelle: Woodbury, NY : Inst., 2016
• Jahr Quelle: 2017
• Band/Heft Quelle: 95(2017,3) Artikel-Nummer 036020, 18 Seiten
• ISSN Quelle: 2470-0029
• DOI: doi:10.1103/PhysRevD.95.036020
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1578485770

Abstract

In this work, we present the first results on vector- and axial-vector meson spectral functions as obtained by applying the nonperturbative functional renormalization group approach to an effective low-energy theory motivated by the gauged linear sigma model. By using a recently proposed analytic continuation method, we study the in-medium behavior of the spectral functions of the ρ and a1 mesons in different regimes of the phase diagram. In particular, we demonstrate explicitly how these spectral functions degenerate at high temperatures as well as at large chemical potentials, as a consequence of the restoration of chiral symmetry. In addition, we also compute the momentum dependence of the ρ and a1 spectral functions and discuss the various timelike and spacelike processes that can occur.