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Paper detail

New Source for QCD Axion Dark Matter Production: Curvature Induced

We discuss a novel mechanism for generating dark matter from a fast-rolling scalar field, relevant for both inflation and rotating axion models, and apply it specifically to the (QCD) axion. Dark matter comes from scalar field fluctuations generated by the product of the curvature perturbation and the fast-rolling background field. These fluctuations can explain the totality of dark matter in a vast axion parameter space, particularly for the QCD axion, which will be targeted by upcoming experiments. We review the constraints on this mechanism and potential gravitational-wave signatures.

preprint2026arXivOpen access
Cem EröncelYann GouttenoireRyosuke SatoGéraldine ServantPeera Simakachorn
astro-ph.COhep-ph
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Cem EröncelYann GouttenoireRyosuke SatoGéraldine ServantPeera Simakachorn

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