Sign-Flipping Axion Potentials via Kapitza-Type Modulation by Heavy Axions
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arXiv
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| Auteurs principaux: | , , |
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866914036259487744 |
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| author | Murai, Kai Takahashi, Fuminobu Tomiyama, Kosei |
| author_facet | Murai, Kai Takahashi, Fuminobu Tomiyama, Kosei |
| contents | We show that the potential of a light axion can flip sign, or even nearly vanish, as a result of coherent oscillations of a heavier axion with which it mixes. This phenomenon is analogous to the Kapitza pendulum, where a high-frequency external force stabilizes an otherwise unstable configuration, but here it arises naturally from the inherent mass hierarchy and mixing among axions in the axiverse, without the need for any externally imposed modulation. We further show that a late-time sign flip of the potential can significantly enhance the abundance of the light axion, which has important cosmological and observational consequences. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_11032 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Sign-Flipping Axion Potentials via Kapitza-Type Modulation by Heavy Axions Murai, Kai Takahashi, Fuminobu Tomiyama, Kosei High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics We show that the potential of a light axion can flip sign, or even nearly vanish, as a result of coherent oscillations of a heavier axion with which it mixes. This phenomenon is analogous to the Kapitza pendulum, where a high-frequency external force stabilizes an otherwise unstable configuration, but here it arises naturally from the inherent mass hierarchy and mixing among axions in the axiverse, without the need for any externally imposed modulation. We further show that a late-time sign flip of the potential can significantly enhance the abundance of the light axion, which has important cosmological and observational consequences. |
| title | Sign-Flipping Axion Potentials via Kapitza-Type Modulation by Heavy Axions |
| topic | High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2509.11032 |