  Phenomena associated with the controlled collapse of a Bose-Einstein
condensate described in the experiment of Donley et al (E. Donley et. al.,
Nature 412, 295 (2001); N. Claussen, Ph. D. Thesis, U. of Colorado (2003)) are
explained here as a consequence of the squeezing and amplification of quantum
fluctuations above the condensate by the condensate dynamics. In analyzing the
changing amplitude and particle contents of these excitations, our simple
physical picture provides excellent quantitative fits with experimental data on
the scaling behavior of the collapse time and the amount of particles emitted
in the jets.
