On the Existence of Combined Condensation of Neutral and Charged Pions in Neutron Matter

Combined condensation of neutral and charged pions at high-density neutron matter is studied in an approach based on the chiral symmetry. Energy density in the combined ;ro-;rc condensed phase to be considered as most energetically favored is derived in a realistic calculation, where we take into account the isobar L1 (1232) degrees of freedom, baryon-baryon short-range correlations described in terms of the Landau-Migdal parameter g', and form factors in the ;r-baryon vertex. Characteristic features of this phase are discussed in comparison with those of the pure ;ro or the pure ;rC condensa tion .. The combined ;ro_;rc condensed phase sets in at baryon density (3~5) times the nuclear density po depending on g' after the appearance of the pure ;rc condensed phase.