Fermionic Universe Hypothesis: Emergent Gravity and Dark Components from a Single Fermion Field

The Fermionic Universe Hypothesis (FUH) postulates a single multicomponent fermion field ψ as the microscopic origin of at least part of the observed particles and interactions. Gauge fields and gravity are interpreted as collective excitations and emergent effects of a fermionic condensate, arising from a fundamental Lagrangian with four‑fermion interactions and its low‑energy effective counterpart. This framework yields testable cosmological and astrophysical predictions, particularly for the dark sector and compact objects.