Meson Effects on Chiral Condensate at Finite Density

Abstract

Meson corrections on chiral condensate up to next-to-leading order in $1/N_c$ expansion at finite density are investigated in NJL model with chiral symmetry explicitly breaking. Compared with the mean-field results, the chiral phase transition is still of first order, while the properties at the critical density of chiral phase transition are found to change significantly.

12 pages, 3 figures, 1 figure changed and 1 figure added, conclusion revised