Journalartikel

Jahr der Veröffentlichung: 2021

Zeitschrift: Physical Review D

Bandnummer: 104

Heftnummer: 5

ISSN: 2470-0010

eISSN: 2470-0029

Open Access Status: Hybrid

DOI Link: https://doi.org/10.1103/PhysRevD.104.054005

Verlag: American Physical Society

Abstract: 
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 rho and the a(1) 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 rho and a(1) 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.

Harvard-Zitierstil: Tripolt, R., Jung, C., von Smekal, L. and Wambach, J. (2021) Vector and axial-vector mesons in nuclear matter, Physical Review D, 104(5), Article 054005. https://doi.org/10.1103/PhysRevD.104.054005

APA-Zitierstil: Tripolt, R., Jung, C., von Smekal, L., & Wambach, J. (2021). Vector and axial-vector mesons in nuclear matter. Physical Review D. 104(5), Article 054005. https://doi.org/10.1103/PhysRevD.104.054005