Searching for dark photon dark matter from terrestrial magnetic fields
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arXiv
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| Main Authors: | , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866911671330537472 |
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| author | Nomura, Kimihiro Nishizawa, Atsushi Taruya, Atsushi Himemoto, Yoshiaki |
| author_facet | Nomura, Kimihiro Nishizawa, Atsushi Taruya, Atsushi Himemoto, Yoshiaki |
| contents | We present a novel search for dark photon dark matter (DM) using terrestrial magnetic field measurements at frequencies below 100 Hz. Coherently oscillating dark photon DM can induce a monochromatic magnetic field via kinetic mixing with ordinary photons. Notably, for dark photon masses $m_{A'}$ around $3 \times 10^{-14}$ eV, the signal can be resonantly amplified within a cavity formed by the Earth's surface and the ionosphere. We compute the expected signal incorporating the effect of atmospheric conductivity, and derive new upper limits on the kinetic mixing parameter $\varepsilon$ from long-term geomagnetic data. These limits improve upon previous ground-based constraints in the mass range of $1 \times 10^{-15}$ eV $\lesssim m_{A'} \lesssim 2 \times 10^{-13}$ eV. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_15783 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Searching for dark photon dark matter from terrestrial magnetic fields Nomura, Kimihiro Nishizawa, Atsushi Taruya, Atsushi Himemoto, Yoshiaki High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics We present a novel search for dark photon dark matter (DM) using terrestrial magnetic field measurements at frequencies below 100 Hz. Coherently oscillating dark photon DM can induce a monochromatic magnetic field via kinetic mixing with ordinary photons. Notably, for dark photon masses $m_{A'}$ around $3 \times 10^{-14}$ eV, the signal can be resonantly amplified within a cavity formed by the Earth's surface and the ionosphere. We compute the expected signal incorporating the effect of atmospheric conductivity, and derive new upper limits on the kinetic mixing parameter $\varepsilon$ from long-term geomagnetic data. These limits improve upon previous ground-based constraints in the mass range of $1 \times 10^{-15}$ eV $\lesssim m_{A'} \lesssim 2 \times 10^{-13}$ eV. |
| title | Searching for dark photon dark matter from terrestrial magnetic fields |
| topic | High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2509.15783 |