Braneworld Baryogenesis and QCD-Era Magnetogenesis: A Predictive Link

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Auteur principal:	Sarrazin, Michaël
Format:	Preprint
Publié:	2026
Sujets:	High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics
Accès en ligne:	Acceder al recurso
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author	Sarrazin, Michaël
author_facet	Sarrazin, Michaël
contents	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.
format	Preprint
id	arxiv_https___arxiv_org_abs_2601_04828
institution	arXiv
publishDate	2026
record_format	arxiv
spellingShingle	Braneworld Baryogenesis and QCD-Era Magnetogenesis: A Predictive Link Sarrazin, Michaël High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics 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.
title	Braneworld Baryogenesis and QCD-Era Magnetogenesis: A Predictive Link
topic	High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics
url	https://arxiv.org/abs/2601.04828

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