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| Auteurs principaux: | , , |
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| Format: | Preprint |
| Publié: |
2025
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| Accès en ligne: | https://arxiv.org/abs/2504.06653 |
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| _version_ | 1866908544558694400 |
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| author | Taruya, Atsushi Nishizawa, Atsushi Himemoto, Yoshiaki |
| author_facet | Taruya, Atsushi Nishizawa, Atsushi Himemoto, Yoshiaki |
| contents | We show that Earth's natural environment can serve as a powerful probe for ultralight axion dark matter. In the presence of global geomagnetic fields, the axions with masses ranging from $10^{-15}\,{\rm eV}-10^{-13}\,{\rm eV}$ induce electromagnetic waves in the (sub-) extremely low-frequency band ($0.3-30\,{\rm Hz}$) through the axion-photon coupling. We predict the amplitude of induced magnetic fields in the Earth-ionosphere cavity, taking the finite conductivity of the atmosphere into account. This allows us to constrain the axion-photon coupling parameter, $g_{\rm aγ}$, from the long-term monitoring data of the low-frequency magnetic fields, resulting in a significant improvement from the previous constraints down to $g_{\rm aγ} \lesssim 4\times10^{-13}\,{\rm GeV}^{-1}$ for axion mass $\sim 3 \times 10^{-14}\,{\rm eV}$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_06653 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Hunting axion dark matter signatures in low-frequency terrestrial magnetic fields Taruya, Atsushi Nishizawa, Atsushi Himemoto, Yoshiaki High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics We show that Earth's natural environment can serve as a powerful probe for ultralight axion dark matter. In the presence of global geomagnetic fields, the axions with masses ranging from $10^{-15}\,{\rm eV}-10^{-13}\,{\rm eV}$ induce electromagnetic waves in the (sub-) extremely low-frequency band ($0.3-30\,{\rm Hz}$) through the axion-photon coupling. We predict the amplitude of induced magnetic fields in the Earth-ionosphere cavity, taking the finite conductivity of the atmosphere into account. This allows us to constrain the axion-photon coupling parameter, $g_{\rm aγ}$, from the long-term monitoring data of the low-frequency magnetic fields, resulting in a significant improvement from the previous constraints down to $g_{\rm aγ} \lesssim 4\times10^{-13}\,{\rm GeV}^{-1}$ for axion mass $\sim 3 \times 10^{-14}\,{\rm eV}$. |
| title | Hunting axion dark matter signatures in low-frequency terrestrial magnetic fields |
| topic | High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2504.06653 |