2008/01/31 by Hiroaki Abuki, H. Abuki, M. Ciminale +6 · 2 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #High-Energy Particle Collisions Research #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1103/physrevd.78.014002
published as Phys.Rev.D78:014002,2008 · 8 pages, 8 figures, RevTeX4 style. One figure added, role of the bare quark mass clarified, some reference added. To appear on Phys. Rev. D
arxiv created 2008/06/12 · openalex publication_date 2008/07/03 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We study the phase diagram and the pion modes in the electrically neutral two flavor Polyakov--Nambu--Jona-Lasinio model. One of the main results of this paper is that in the model with massive quarks, when electrical neutrality is required, pions do not condense in the ground state of the model: the isospin chemical potential \ensuremathμI=\ensuremath-\ensuremathμe/2 is always smaller than the value required for pion condensation to occur. Moreover we investigate on the pions and \ensuremathσ mass spectra. We find that the qualitative behavior of the masses resembles that obtained in the Nambu--Jona-Lasinio model. We close this paper by studying the intriguing possibility that bound states with the quantum numbers of the pions can be formed above the chiral phase transition.