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| Autores principales: | , |
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| Formato: | Preprint |
| Publicado: |
2025
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| Materias: | |
| Acceso en línea: | https://arxiv.org/abs/2506.16932 |
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| _version_ | 1866908492578684928 |
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| author | Naydenov, Momchil Salvio, Alberto |
| author_facet | Naydenov, Momchil Salvio, Alberto |
| contents | An effective Lagrangian for the interaction between a pseudo-scalar (axion-like) field and massive fermions is considered. At high density and non-zero temperature axions can be produced through bremsstrahlung. If the axion-neutron interaction is greater than a certain value we can have a mean free path smaller than the size of a neutron star. The influence of such trapped axions on the mass-radius function of the neutron star is investigated by solving numerically the Tolman-Oppenheimer-Volkoff equations. We show that causality limits the applicability of the trapping regime. We find specific ranges of central densities and temperatures of a neutron star for which axions give a conspicuous contribution to the neutron-star mass. For other densities and temperatures axions do not have a significant effect on the structure of a neutron star. Since we use an effective approach our results can be easily applied to specific axion models. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_16932 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Axion contribution to the mass-radius relation of neutron stars Naydenov, Momchil Salvio, Alberto High Energy Physics - Phenomenology An effective Lagrangian for the interaction between a pseudo-scalar (axion-like) field and massive fermions is considered. At high density and non-zero temperature axions can be produced through bremsstrahlung. If the axion-neutron interaction is greater than a certain value we can have a mean free path smaller than the size of a neutron star. The influence of such trapped axions on the mass-radius function of the neutron star is investigated by solving numerically the Tolman-Oppenheimer-Volkoff equations. We show that causality limits the applicability of the trapping regime. We find specific ranges of central densities and temperatures of a neutron star for which axions give a conspicuous contribution to the neutron-star mass. For other densities and temperatures axions do not have a significant effect on the structure of a neutron star. Since we use an effective approach our results can be easily applied to specific axion models. |
| title | Axion contribution to the mass-radius relation of neutron stars |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2506.16932 |