Unary Field Theory: The Primordial Black Hole Mass Peak at M ~ 10⁻⁵ M☉

The Unary Field Theory (UFT) predicts a narrow peak in the primordial black hole (PBH) mass function at M_PBH ∼ 10⁻⁵ M☉, arising from oscillatory features in the primordial curvature power spectrum P_R(k) generated by coherent reheating oscillations of the unary field Ψ. The same mechanism (Ψ oscillations at frequency m_φ = 1.1 × 10⁻²² eV) also produces the CMB B-mode bump at ℓ ∼ 85–95 (UFT Prediction Paper VIII), making the PBH peak and B-mode bump co-generated, cross-validating signatures anchored to the same UFT parameters. The peak falls in the asteroidal-mass window, accessible to LSST/Roman microlensing (Einstein timescale t_E ∼ 0.1–1 day) and the Einstein Telescope high-frequency GW searches (f ∼ 10³–10⁴ Hz). This paper provides the step-by-step derivation of M_PBH ∼ 10⁻⁵ M☉ from the fundamental UFT parameters, and outlines the detection strategy. This is UFT Prediction Paper X; the unified framework is in the main paper: Zou (2026), doi:10.5281/zenodo.21186809.