TY  - JOUR
A1  - Tripolt, Ralf-Arno
A1  - Jung, Christopher
A1  - Smekal, Lorenz von
A1  - Wambach, Jochen
T1  - Vector and axial-vector mesons in nuclear matter
T2  - Physical review D
N2  - As a first step towards a realistic phenomenological description of vector and axial-vector mesons in nuclear matter, we calculate the spectral functions of the ρ and the a1 meson in a chiral baryon-meson model as a low-energy effective realization of QCD, taking into account the effects of fluctuations from scalar mesons, nucleons, and vector mesons within the functional renormalization group (FRG) approach. The phase diagram of the effective hadronic theory exhibits a nuclear liquid-gas phase transition as well as a chiral phase transition at a higher baryon-chemical potential. The in-medium ρ and a1 spectral functions are calculated by using the previously introduced analytically-continued FRG (aFRG) method. Our results show strong modifications of the spectral functions—in particular near the critical endpoints of both phase transitions—which may well be of relevance for electromagnetic rates in heavy-ion collisions or neutrino emissivities in neutron-star merger events.
KW  - Finite temperature field theory
KW  - Functional renormalization group
KW  - Nuclear matter
KW  - Particle decays
KW  - Quantum field theory
KW  - Spontaneous symmetry breaking
KW  - Strong interaction
Y1  - 2021
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/63219
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-632198
SN  - 2470-0029
N1  - Funded by SCOAP
VL  - 104
IS  - 5, art. 4005
SP  - 1
EP  - 17
PB  - Inst.
CY  - Woodbury, NY
ER  -