2000/01/14 by V. A. Sadovnikova, Sadovnikova, V. A.
Engineering · Physics and Astronomy · #FOS: Physical sciences #High-Energy Particle Collisions Research #Nuclear Theory (nucl-th) #Quantum Chromodynamics and Particle Interactions #Superconducting Materials and Applications #nucl-th
paper · pdf · doi:10.48550/arxiv.nucl-th/0001025
10 pages, Latex, 3 figures; replacement: additional references, talk at Workshop on Quark Condensates in Nuclear Matter, ECT* Trento,Italy,1999
openalex publication_date 2000/01/14 · arxiv created 2000/03/15 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
In symmetrical nuclear matter the solutions of pion dispersion equation are investigated in the complex plane of the pion frequency ω. There are three well-known branches of solutions on the physical sheet : sound, pion and isobar, at the matter density less than the critical one ρ<ρc. At ρ>ρc the fourth branch appears on the physical sheet. For this branch the condition ω2c≤0 (in general case Reω2c≤0) takes place. This points out the instability of the ground state which is possibly related to the pion condensation.