TY  - JOUR
A1  - Torres-Rincon, Juan M.
T1  - Degeneracy patterns of chiral companions at finite temperature
T2  - Symmetry
N2  - Chiral symmetry represents a fundamental concept lying at the core of particle and nuclear physics. Its spontaneous breaking in vacuum can be exploited to distinguish chiral hadronic partners, whose masses differ. In fact, the features of this breaking serve as guiding principles for the construction of effective approaches of QCD at low energies, e.g., the chiral perturbation theory, the linear sigma model, the (Polyakov)–Nambu–Jona-Lasinio model, etc. At high temperatures/densities chiral symmetry can be restored bringing the chiral partners to be nearly degenerated in mass. At vanishing baryochemical potential, such restoration follows a smooth transition, and the chiral companions reach this degeneration above the transition temperature. In this work I review how different realizations of chiral partner degeneracy arise in different effective theories/models of QCD. I distinguish the cases where the chiral states are either fundamental degrees of freedom or (dynamically-generated) composed states. In particular, I discuss the intriguing case in which chiral symmetry restoration involves more than two chiral partners, recently addressed in the literature.
KW  - chiral symmetry restoration
KW  - finite-temperature quantum-field theory
KW  - mass degeneracy
KW  - effective field theories
KW  - chiral perturbation theory
KW  - linear sigma mode
KW  - Nambu–Jona-Lasinio model
KW  - heavy-quark effective theory
Y1  - 2021
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/62653
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-626538
SN  - 2073-8994
N1  - This research was funded by the Deutsche Forschungsgemeinschaft (German Research Foundation) grant numbers 411563442 (Hot Heavy Mesons) and 315477589—TRR 211 (Strong-interaction matter under extreme conditions).
VL  - 13
IS  - 8, art. 1400
SP  - 1
EP  - 31
PB  - MDPI
CY  - Basel
ER  -