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We explore the possibility that the expansion of the universe can be drivenby a condensate of spinors which are free of interactions on a 5D relativisticvacuum defined on an extended de Sitter spacetime which is Riemann-flat. Theextra coordinate is considered as noncompact. After making a static foliationon the extra coordinate, we obtain an effective 4D (inflationary) de Sitterexpansion which describes an inflationary universe. We found that thecondensate of spinors here studied could be an interesting candidate to explainthe presence of dark energy in the early universe. The dark energy densitywhich we are talking about is poured into smaller sub-horizon scales with theevolution of the inflationary expansion.

Primordial dark energy from a condensate of spinors in a 5D vacuum