Neutrino Metric Model (NMM v2.2): Λ–κ Framework

The Neutrino Metric Model (NMM v2.2) presents a unified alternative to ΛCDM cosmology. It replaces both dark matter and dark energy with a single physical mechanism: pressure gradients in the cosmic neutrino–photon field, forming the quantum atmosphere of space. Within this framework, gravitational acceleration arises as a metric reaction to neutrino pressure inhomogeneities rather than as a force between masses.The model introduces a universal metric constant κ ≈ 10²⁶ m³/kg linking pressure gradients and acceleration across all scales — from planetary systems to superclusters — and reproduces observed galactic rotation curves, the Hubble tension, and large-scale flows without unseen components.Version 2.2 formalizes the covariant field equations, derives κ from neutrino microphysics, and extends the model to strong-field regimes (metric knots, quasars, and Laniakea pressure flows). Appendices include validation tests, SPARC galaxy analysis, and numerical tables confirming internal consistency and falsifiability.