https://doi.org/10.1140/epjc/s10052-025-14898-0
Regular Article - Theoretical Physics
Stellar light scattering as a probe for a braneworld-induced baryogenesis scenario
1
Université Marie et Louis Pasteur, CNRS, Institut UTINAM (UMR 6213), Équipe de Physique Théorique, 25000, Besançon, France
2
Department of Physics, University of Namur, 5000, Namur, Belgium
a
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Received:
24
July
2025
Accepted:
25
September
2025
Published online:
22
October
2025
Abstract
A recent baryogenesis scenario (Sarrazin and Stasser in Phys Rev D 110:023520, 2024), rooted in a two-brane Universe model, proposed a solution to the matter–antimatter asymmetry through the dynamics of a new pseudo-scalar field. In the present paper, one investigates the phenomenological consequences of this proposal. One shows that the associated boson could persist as a relic from the early Universe, forming a subdominant component of dark matter. While its overall cosmological density is small (
), one demonstrates that a one-loop process facilitates an ultra-weak coupling to photons, leading to a distinctive scattering signature. One argues that this effect could produce a faint, glowing halo around massive, hot stars, characterized by a unique spectral decay. Detecting or constraining this elusive light with current and future instruments like the JWST would provide a powerful and direct observational test of the underlying braneworld dynamics and its connection to baryogenesis.
© The Author(s) 2025
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