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This theoretical study demonstrates that primordial magnetic fields of approximately 10^10 Tesla strength, generated during the quark-hadron transition in the early universe, are required for the braneworld baryogenesis mechanism to produce the observed matter-antimatter asymmetry. The researchers show that magnetic field fluctuations create a baryon-density spectrum consistent with Cosmic Microwave Background observations, establishing a testable connection between early universe magnetogenesis and the origin of matter dominance. The work integrates stochastic magnetic field modeling with a baryogenesis scenario involving coupling between visible and hidden matter sectors through a pseudo-scalar field.
Why it matters
This research provides a predictive framework linking two fundamental cosmological puzzles: why the universe contains more matter than antimatter and the origin of cosmic magnetic fields. The specific magnetic field strength prediction offers a testable constraint that could be validated or ruled out by future observational data from the Cosmic Microwave Background and large-scale structure studies.
Understand the Science
arXiv:2601.04828v3 Announce Type: replace-cross
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.
Source: Braneworld Baryogenesis and QCD-Era Magnetogenesis: A Predictive Link