DMDE Triplepoint + CosmoGate: MeV mediator closurepoint, SIDM windows, and a temperature-gated N_eff portal (v0.4.1)

This record contains a Zenodo release pack (v0.4.1) for DMDE Triplepoint + CosmoGate — a working-hypothesis framework linking (i) an MeV-scale mediator “closure point” target and (ii) a temperature-gated dark-radiation portal affecting ΔN_eff, with falsifiable diagnostics and kill tests.

Status: working hypothesis / not peer-reviewed. Several curves are illustrative proxies/toy mappings and are included as “if–then” diagnostics (not detection claims).

1) Triplepoint / closure-point target (MeV mediator)

• Kinetically mixed vector mediator A′ (dark photon) with an illustrative closure point near m_A′ ≈ 4.33 MeV and ε ≈ 4.27×10⁻¹⁰, where proxy curves for BBN decay-before, direct-detection reach, and SN1987A cooling onset intersect.

• Same region overlaps velocity-dependent SIDM windows (dwarf/Milky Way/cluster scales) in an illustrative Born-regime Yukawa treatment.

2) CosmoGate (temperature-gated ΔN_eff portal)

• A temperature-gated portal that suppresses dark-sector radiation at high temperature and turns on near MeV-scaletemperatures, yielding a tunable N_eff(T_on).

• Includes a toy inversion N_eff → T_on → f_peak to connect the gate scale to an indicative nHz GW peak-frequency range (PTA-relevant), as a falsifiable diagnostic (not a detection claim).

Contents

• PDFs (one-pagers / referee-core notes / inversion memo / kill-test appendix)

• Figures (PNG) + inversion tables (CSV)

• Reproducible Python scripts to regenerate plots and scans

v0.4.1 highlights

• Triplepoint target region summarized with SIDM velocity-dependence sanity checks

• CosmoGate: N_eff ↔ T_on mapping with Planck/ACT bands (toy) + inversion tables

• N_eff → f_peak (toy) diagnostic for PTA-relevant frequency scale

• Kill-test appendix + reproducibility scripts