Axion Superradiance in Dipole Magnetic Fields of Pulsars
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arXiv
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| Hauptverfasser: | , , |
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| Format: | Preprint |
| Veröffentlicht: |
2025
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| _version_ | 1866915326609850368 |
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| author | Sirkiä, Topi Heikinheimo, Matti Tuominen, Kimmo |
| author_facet | Sirkiä, Topi Heikinheimo, Matti Tuominen, Kimmo |
| contents | We consider constraints on the axion-photon coupling by superradiance due to a plasma instability in the magnetospheres of millisecond pulsars. We compute the growth rate of a superradiant axion cloud in a dipole magnetic field, and give a semi-analytical formula for the superradiance rate for the lowest state. By requiring the associated instability time to be longer than the characteristic age of the supermassive black-widow millisecond pulsar PSR J0952-0607, we examine the pulsar-timing array constraints on axions of mass $\sim 10^{-12}\text{ eV}$. We find that competitive axion bounds from plasma instabilities are unlikely unless a new high spin pulsar is discovered. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_04209 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Axion Superradiance in Dipole Magnetic Fields of Pulsars Sirkiä, Topi Heikinheimo, Matti Tuominen, Kimmo High Energy Physics - Phenomenology High Energy Astrophysical Phenomena We consider constraints on the axion-photon coupling by superradiance due to a plasma instability in the magnetospheres of millisecond pulsars. We compute the growth rate of a superradiant axion cloud in a dipole magnetic field, and give a semi-analytical formula for the superradiance rate for the lowest state. By requiring the associated instability time to be longer than the characteristic age of the supermassive black-widow millisecond pulsar PSR J0952-0607, we examine the pulsar-timing array constraints on axions of mass $\sim 10^{-12}\text{ eV}$. We find that competitive axion bounds from plasma instabilities are unlikely unless a new high spin pulsar is discovered. |
| title | Axion Superradiance in Dipole Magnetic Fields of Pulsars |
| topic | High Energy Physics - Phenomenology High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2504.04209 |