Pion and kaon condensation in a 3-flavor NJL model
  We analyze the phase diagram of a three-flavor Nambu-Jona-Lasinio model at finite temperature $T$ and chemical potentials $\mu_u, \mu_d, \mu_s$. We study the competition of pion and kaon condensation and we propose a physical situation in which kaon condensation could be led only by light quark finite densities. 
A. Barducci, R. Casalbuoni, G. Pettini, L. Ravagli