Short form
Paper 5 — Kerr Limit and Radiation Phase
Explores three early structural questions: how black-hole spin affects the temperature prediction, whether the Vaidya radiation phase is compatible with an isotropic CMB bath, and what early-time interior physics is required. The analysis favors the Schwarzschild limit, rules out the naive Vaidya null-dust phase for CMB acoustics, and sharpens the framework's early-radiation picture.