  The effective kaon mass in dense baryonic matter is calculated based on PCAC,
current algebra and the Weinberg smoothness hypothesis. The off-shell behavior
of the K-N scattering amplitudes is treated consistently with PCAC, and the
effects of the subthreshold K-N resonances are also included. The effective
kaon mass is found to depend crucially on the K-N sigma term. Since the current
estimates of K-N Sigma term are very uncertain, we discuss various scenarios
treating K-N Sigma term as an input parameter; for certain values of K-N Sigma
a collective mode of a hyperon-particle-nucleon-hole state appears at high
densities, possibly leading to kaon condensation.
