Current hot big-bang cosmology includes an unknown particle or
field called an inflaton, producing a negative pressure vacuum, that
brings about an exponential ( superluminal) expansion of the nascent
universe. I propose that this inflation was in fact produced by the
inchoate universe being originally constituted with photons, then
undergoing a phase change to less energetic, more matter like substance.
There's no need to explain with exotic conditions and forces when a
simple solution using current models is available; a reassessment of
parameters, not a total revision appealing to unknown aspects! That's
more magic than science.

P.C.Stelzner