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arXiv · 2601.04828

Braneworld Baryogenesis and QCD-Era Magnetogenesis: A Predictive Link

Michaël Sarrazin
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Abstract

We demonstrate that primordial magnetic fields (PMF) play a decisive role in the braneworld baryogenesis scenario of [Phys. Rev. D $\textbf{110}$, 023520 (2024)], where C/CP violation arises from the coupling of visible and hidden matter-antimatter sectors through a pseudo-scalar field. Although this mechanism generates baryon number efficiently only after the quark-hadron transition, by incorporating a realistic stochastic PMF within a semi-analytical framework, we find that matching the observed baryon-antibaryon asymmetry robustly requires PMF strengths of order $10^{10}$ T right after the transition, in agreement with causal QCD-era magnetogenesis. We further reveal that magnetic fluctuations drive the baryon-density spectrum to white noise on large scales, yielding an isocurvature component compatible with Cosmic Microwave Background (CMB) bounds. This establishes a predictive link between the braneworld baryogenesis model and realistic early-Universe magnetic fields.

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Michaël Sarrazin. 2026-07-13. Braneworld Baryogenesis and QCD-Era Magnetogenesis: A Predictive Link. https://doi.org/10.1140/epjc%2Fs10052-026-16069-1

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