  We previously showed that we can use particle-anti particle pairs as a model
of how nucleation of a new universe occurs. We now can construct a model
showing evolution from a dark matter- dark energy mix to a pure cosmological
constant cosmology due to changes in the slope of the resulting scalar field,
using much of Scherrer's k-essence model. This same construction permits a use
of the speed of sound, in k essence models,evolving from zero to one. Having
the sound speed eventually reach unity permits matching conventional
cosmological constant observations in the aftermath of change of slope of a
soliton anti soliton pair during the nucleation process of a new universe. This
also assumes that Scherrer's derivation of a sound speed being zero is
appropriate during initial inflationary cosmology.
