Stochastic Axion Mixing: A General Mechanism Beyond Decay Constant Constraints
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arXiv
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| Format: | Preprint |
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2026
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| _version_ | 1866911636243087360 |
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| author | Li, Hai-Jun |
| author_facet | Li, Hai-Jun |
| contents | We propose a novel and generalized mechanism, dubbed stochastic axion mixing. In a multi-axion framework, this mixing occurs naturally provided that the masses of all ultra-light axion-like particles (ALPs) are distinct and lighter than the zero-temperature mass of the QCD axion. Crucially, this mechanism is independent of the relative magnitudes of the axion decay constants. In contrast to the conventional maximal mixing scenario -- which strictly relies on specific decay constant hierarchies -- stochastic mixing represents a significantly broader formalism. Notably, maximal mixing emerges as a specific subset of stochastic mixing under restrictive conditions. This new mechanism offers profound implications for axion cosmology. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2604_27784 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Stochastic Axion Mixing: A General Mechanism Beyond Decay Constant Constraints Li, Hai-Jun High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics We propose a novel and generalized mechanism, dubbed stochastic axion mixing. In a multi-axion framework, this mixing occurs naturally provided that the masses of all ultra-light axion-like particles (ALPs) are distinct and lighter than the zero-temperature mass of the QCD axion. Crucially, this mechanism is independent of the relative magnitudes of the axion decay constants. In contrast to the conventional maximal mixing scenario -- which strictly relies on specific decay constant hierarchies -- stochastic mixing represents a significantly broader formalism. Notably, maximal mixing emerges as a specific subset of stochastic mixing under restrictive conditions. This new mechanism offers profound implications for axion cosmology. |
| title | Stochastic Axion Mixing: A General Mechanism Beyond Decay Constant Constraints |
| topic | High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2604.27784 |