Phase structure of excited baryonic matter in the relativistic mean field theory

  • We analyze the phase structure of the nonlinear mean-field meson theory of baryonic matter (nucleons plus delta resonances). Depending on the choice of the coupling constants, we find three physically distinct phase transitions in this theory: a nucleonic liquid-gas transition in the low temperature, Tc<20 MeV, low density, &#961;&#8771;0.5&#961;0, regime, a high-temperature (T&#8771;150 MeV) finite density transition from a gas of massive hadrons to a nearly massless baryon, antibaryon plasma, and, third, a strong phase transition from the nucleonic fluid to a resonance-dominated ‘‘delta-matter’’ isomer at &#961;>2&#961;0 and Tc<50 MeV. All three phase transitions are of first order. It is shown that the occurrence of these different phase transitions depends critically on the coupling constants. Since the production of pions also depends strongly on the coupling constants, it is seen that the equation of state cannot be derived unambiguously from pion data.

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Author:Béla Waldhauser, Jürgen Theis, Joachim MaruhnORCiDGND, Horst StöckerORCiDGND, Walter GreinerGND
Parent Title (German):Physical review C
Document Type:Article
Date of Publication (online):2006/06/09
Year of first Publication:1987
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2006/06/09
Page Number:8
First Page:1019
Last Page:1026
PACS: 25.70.-z
Institutes:Physik / Physik
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Licence (German):License LogoDeutsches Urheberrecht