Absorption of Axion Dark Matter in a Magnetized Medium
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arXiv
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| Format: | Preprint |
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2023
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| _version_ | 1866916693331148800 |
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| author | Berlin, Asher Trickle, Tanner |
| author_facet | Berlin, Asher Trickle, Tanner |
| contents | Detection of axion dark matter heavier than a meV is hindered by its small wavelength, which limits the useful volume of traditional experiments. This problem can be avoided by directly detecting in-medium excitations, whose $\sim \text{meV} - \text{eV}$ energies are decoupled from the detector size. We show that for any target inside a magnetic field, the absorption rate of electromagnetically-coupled axions into in-medium excitations is determined by the dielectric function. As a result, the plethora of candidate targets previously identified for sub-GeV dark matter searches can be repurposed as broadband axion detectors. We find that a $\text{kg} \cdot \text{yr}$ exposure with noise levels comparable to recent measurements is sufficient to probe parameter space currently unexplored by laboratory tests. Noise reduction by only a few orders of magnitude can enable sensitivity to the QCD axion in the $\sim 10 \ \text{meV} - 10 \ \text{eV}$ mass range. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2305_05681 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Absorption of Axion Dark Matter in a Magnetized Medium Berlin, Asher Trickle, Tanner High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics Materials Science High Energy Physics - Experiment Detection of axion dark matter heavier than a meV is hindered by its small wavelength, which limits the useful volume of traditional experiments. This problem can be avoided by directly detecting in-medium excitations, whose $\sim \text{meV} - \text{eV}$ energies are decoupled from the detector size. We show that for any target inside a magnetic field, the absorption rate of electromagnetically-coupled axions into in-medium excitations is determined by the dielectric function. As a result, the plethora of candidate targets previously identified for sub-GeV dark matter searches can be repurposed as broadband axion detectors. We find that a $\text{kg} \cdot \text{yr}$ exposure with noise levels comparable to recent measurements is sufficient to probe parameter space currently unexplored by laboratory tests. Noise reduction by only a few orders of magnitude can enable sensitivity to the QCD axion in the $\sim 10 \ \text{meV} - 10 \ \text{eV}$ mass range. |
| title | Absorption of Axion Dark Matter in a Magnetized Medium |
| topic | High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics Materials Science High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2305.05681 |