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| Main Authors: | , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2502.18931 |
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| _version_ | 1866913923351969792 |
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| author | Hamaguchi, Koichi Nagata, Natsumi Zheng, Jiaming |
| author_facet | Hamaguchi, Koichi Nagata, Natsumi Zheng, Jiaming |
| contents | We investigate axion emission from singlet proton Cooper pairs in neutron stars, a process that dominates axion emission in young neutron stars in the KSVZ model. By re-deriving its emissivity, we confirm consistency with most existing literature, except for a recent study that exhibits a different dependence on the effective mass. This discrepancy results in more than an order-of-magnitude deviation in emissivity, significantly impacting constraints on the KSVZ axion from the cooling observations of the Cassiopeia A neutron star. Furthermore, we examine uncertainties arising from neutron-star equations of state and their role in the discrepancy, finding that the large deviation persists regardless of the choice of equations of state. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_18931 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Axion Emission from Proton Cooper Pairs in Neutron Stars Hamaguchi, Koichi Nagata, Natsumi Zheng, Jiaming High Energy Physics - Phenomenology We investigate axion emission from singlet proton Cooper pairs in neutron stars, a process that dominates axion emission in young neutron stars in the KSVZ model. By re-deriving its emissivity, we confirm consistency with most existing literature, except for a recent study that exhibits a different dependence on the effective mass. This discrepancy results in more than an order-of-magnitude deviation in emissivity, significantly impacting constraints on the KSVZ axion from the cooling observations of the Cassiopeia A neutron star. Furthermore, we examine uncertainties arising from neutron-star equations of state and their role in the discrepancy, finding that the large deviation persists regardless of the choice of equations of state. |
| title | Axion Emission from Proton Cooper Pairs in Neutron Stars |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2502.18931 |