  This article combines two talks given by the authors and is based on works
done in collaboration with G.E. Brown and D.-P. Min on kaon condensation in
dense baryonic medium treated in chiral perturbation theory using heavy-baryon
formalism. It contains, in addition to what was recently published,
astrophysical backgrounds for kaon condensation discussed by Brown and Bethe, a
discussion on a renormalization-group analysis to meson condensation worked out
together with H.K. Lee and S.-J. Sin, and the recent results of K. M.
Westerberg in the bound-state approach to the Skyrme model. Negatively charged
kaons are predicted to condense at a critical density $2\lsim \rho/\rho_0\lsim
4$, in the range to allow the intriguing new phenomena predicted by Brown and
Bethe to take place in compact star matter.
