  We explore a collapsing cosmology driven by a scalar field which is minimally
coupled to gravity in a spatially at and spherically symmetric, isotropic and
homogeneous space-time, with a variable timescale that avoids the final
singularity. The equation of state that describes the collapse is $\omega=1$.
We calculate the back-reaction of the space-time during the collapse and the
energy density fluctuations related to this back-reaction has a spectral index
$n_s = 0$, favouring short-wavelengths modes to be detected. The interesting is
that the amplitude of these fluctuations increase with time when the collapse
is sufficiently strong.
