Harmonic oscillator with strongly pulsating mass

Abstract
An exact solution is presented for the problem of a harmonic oscillator of frequency ω0 and mass varying with time according to M = MO cos2 νt. The solution is closely related to that of an oscillator of constant mass MO and frequency (ωO2 + ν2)1/2. Pseudostationary and quasicoherent states are discussed. Applications in quantum optics are foreseen.