Electromagnetic instability of compact axion stars
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arXiv
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| Autores principales: | , , , , , |
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| Formato: | Preprint |
| Publicado: |
2023
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| _version_ | 1866909401578733568 |
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| author | Chung-Jukko, Liina M. Lim, Eugene A. Marsh, David J. E. Aurrekoetxea, Josu C. de Jong, Eloy Ge, Bo-Xuan |
| author_facet | Chung-Jukko, Liina M. Lim, Eugene A. Marsh, David J. E. Aurrekoetxea, Josu C. de Jong, Eloy Ge, Bo-Xuan |
| contents | If the dark matter is composed of axions, then axion stars are expected to be abundant in the Universe. We demonstrate in fully non-linear (3+1) numerical relativity the instability of compact axion stars due to the electromagnetic Chern-Simons term. We show that above the critical coupling constant $g_{aγ}^\mathrm{crit} \propto M_s^{-1.35}$, compact axion stars of mass $M_s$ are unstable. The instability is caused by parametric resonance between the axion and the electromagnetic field. The existence of stable compact axion stars requires approximately Planck-suppressed couplings to photons. If the coupling exceeds the critical value, then all stable axion stars are necessarily non-compact. Unstable axion stars decay leaving behind a less massive, less compact, remnant. The emitted radiation peaks at frequency $ω\sim 1/R_s$, where $R_s$ is the axion star radius. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2302_10100 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Electromagnetic instability of compact axion stars Chung-Jukko, Liina M. Lim, Eugene A. Marsh, David J. E. Aurrekoetxea, Josu C. de Jong, Eloy Ge, Bo-Xuan High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Theory If the dark matter is composed of axions, then axion stars are expected to be abundant in the Universe. We demonstrate in fully non-linear (3+1) numerical relativity the instability of compact axion stars due to the electromagnetic Chern-Simons term. We show that above the critical coupling constant $g_{aγ}^\mathrm{crit} \propto M_s^{-1.35}$, compact axion stars of mass $M_s$ are unstable. The instability is caused by parametric resonance between the axion and the electromagnetic field. The existence of stable compact axion stars requires approximately Planck-suppressed couplings to photons. If the coupling exceeds the critical value, then all stable axion stars are necessarily non-compact. Unstable axion stars decay leaving behind a less massive, less compact, remnant. The emitted radiation peaks at frequency $ω\sim 1/R_s$, where $R_s$ is the axion star radius. |
| title | Electromagnetic instability of compact axion stars |
| topic | High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Theory |
| url | https://arxiv.org/abs/2302.10100 |