Chapter 46: The Beta-Decay Bookends

The temporal phase of the universe — the entire epoch in which measurable clocks exist, particles interact, and structure forms — is framed by two β-decay processes. It opens with primordial β^- decay (n → p + e^- + ν_e): the first physical process, whose products form the H/He gas that is space. It closes with neutronization (p + e^- → n + ν_e) in stellar collapse: the reverse reaction, which opens the topological channel to black hole formation.

Between these bookends, the entire history of the observable universe unfolds as a single density gradient: the near-homogeneous primordial gas differentiates, collapses, forms stars, synthesizes heavy elements, produces compact remnants, and ultimately yields the BH-dominated late epoch. Every stage is a regime of the same τ-Einstein equation at a different refinement depth.

The neutrinos produced at both bookends — and at every β-decay event in between — form a cosmic thread: the neutrino background is the fossil record of the temporal phase.

This chapter tells the story.