Primordial dark energy from a condensate of spinors in a 5D vacuum
  We explore the possibility that the expansion of the universe can be driven
by a condensate of spinors which are free of interactions on a 5D relativistic
vacuum defined on an extended de Sitter spacetime which is Riemann-flat. The
extra coordinate is considered as noncompact. After making a static foliation
on the extra coordinate, we obtain an effective 4D (inflationary) de Sitter
expansion which describes an inflationary universe. We found that the
condensate of spinors here studied could be an interesting candidate to explain
the presence of dark energy in the early universe. The dark energy density
which we are talking about is poured into smaller sub-horizon scales with the
evolution of the inflationary expansion.
