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Teilchentee SS 2020
Thursday, 16:15 (Happy chatting, discussing etc commences at 16:00)
Date: 18.6.2020
Speaker: Lorenz von Smekal
Title: In-medium spectral functions of vector and axial vector mesons from analytically continued FRG flow equations
Abstract
The Functional Renormalization Group can be used to calculate spectral functions from analytically continued flow equations for two-point correlation functions. Here we report on the current status of applying this aFRG framework to the calculation of vector and axial-vector meson spectral functions in effective hadronic theories at finite temperature and density. Their medium modifications have a direct impact on the electromagnetic spectral function and thus on thermal dilepton rates in the range of invariant-mass values of up to about 1 GeV. Because chiral symmetry restoration at finite temperature and/or density is reflected in these spectral functions, this can be exploited to search for experimental signatures, from heavy-ion collisions at HADES energies and later with CBM at FAIR, of a chiral first-order phase transition and the associated critical endpoint (CEP) in the phase diagram of QCD.
