Axion spine angle
v211_axion_spine_angle.py · frontier
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axion DM, the spine-angle branch θ_i = π N_fam/g_car = 3π/5 (108°): an ALTERNATIVE, more robust misalignment angle than the determinant-line hilltop θ_i≈170° (v185, which over-produces Ω_a h²≈0.66). [I] rational motive θ_i=π N_fam/g_car=3π/5=108° exactly (spine quotient 3/5, no fit); [N] the v185 finite-T solver (θ=1→0.03) reaches Ω_DM at θ≈106°, so 108° is essentially on target (harmonic 0.03θ²=0.107); [C] ROBUST: 108° is 62° below the 170° hilltop, in the mild-anharmonic regime — not exponentially sensitive, a far more robust landing than v185; [O] HONEST: an alternative ansatz to θ_i=π(1−φ_seam)≈170° (mutually exclusive, neither forced — the full solver decides, DM.AXION.SPINE.01); [X] kill test: full finite-T solve, Ω_a h² outside ~[0.08,0.16] demotes the branch. A [C] kill-test branch, NOT a closure.
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