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arXiv · 2607.21008

Reviving the Affleck-Dine Curvaton Scenario with Compensated Isocurvature Perturbations

Masahiro Kawasaki·Shunsuke Neda
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Abstract

We revisit the Affleck-Dine curvaton scenario in the framework of supersymmetry, taking Q-ball formation into account. In this scenario, a scalar field carrying baryon number, namely the Affleck-Dine field, generates both the curvature perturbations and the baryon asymmetry of the Universe. However, correlated baryon isocurvature perturbations are inevitably generated, resulting in excessively large correlated matter isocurvature perturbations. We propose a mechanism to suppress them, in which the correlated baryon isocurvature perturbations are canceled by anti-correlated dark matter isocurvature perturbations, thereby realizing compensated isocurvature perturbations. We show that the scenario can simultaneously account for the baryon asymmetry and the observed curvature perturbations of the Universe without generating excessively large matter isocurvature perturbations.

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Masahiro Kawasaki, Shunsuke Neda. 2026-07-23. Reviving the Affleck-Dine Curvaton Scenario with Compensated Isocurvature Perturbations. https://arxiv.org/abs/2607.21008

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