Generalized neutrino isocurvature
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arXiv
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| Main Authors: | , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866910157103955968 |
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| author | Gerlach, Christopher Ratzinger, Wolfram Schwaller, Pedro |
| author_facet | Gerlach, Christopher Ratzinger, Wolfram Schwaller, Pedro |
| contents | Searches for neutrino isocurvature usually constrain a specific linear combination of isocurvature perturbations. In this work, we discuss realistic cosmological scenarios giving rise to neutrino isocurvature. We show that in general both, neutrino and matter isocurvature perturbations are generated, whose ratio we parameterize by a newly introduced mixing angle. We obtain the first limits on this new mixing angle from PLANCK data, and discuss novel insights into the early Universe that could be provided by future measurements. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_17047 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Generalized neutrino isocurvature Gerlach, Christopher Ratzinger, Wolfram Schwaller, Pedro High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics Searches for neutrino isocurvature usually constrain a specific linear combination of isocurvature perturbations. In this work, we discuss realistic cosmological scenarios giving rise to neutrino isocurvature. We show that in general both, neutrino and matter isocurvature perturbations are generated, whose ratio we parameterize by a newly introduced mixing angle. We obtain the first limits on this new mixing angle from PLANCK data, and discuss novel insights into the early Universe that could be provided by future measurements. |
| title | Generalized neutrino isocurvature |
| topic | High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2504.17047 |