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@ARTICLE{Roy:646139,
      author       = {Roy, Sandip and Prabhu, Anirudh and Thompson, Christopher
                      and Witte, Samuel and Blanco, Carlos and Zhang, Jonathan},
      title        = {{S}earching for axion dark matter near relaxing magnetars},
      journal      = {Physical review / D},
      volume       = {113},
      number       = {4},
      issn         = {2470-0010},
      address      = {Ridge, NY},
      publisher    = {American Physical Society},
      reportid     = {PUBDB-2026-00739, arXiv:2505.20450. DESY-25-050},
      pages        = {043001},
      year         = {2026},
      note         = {cc-by, 38 pages, 13 figures},
      abstract     = {Axion dark matter passing through the magnetospheres of
                      magnetars can undergo hyperefficient resonant mixing with
                      low-energy photons, leading to the production of narrow
                      spectral lines that could be detectable on Earth. Since this
                      is a resonant process triggered by the spatial variation in
                      the photon dispersion relation, the luminosity and spectral
                      properties of the emission are highly sensitive to the
                      charge and current densities permeating the magnetosphere.
                      To date, a majority of the studies investigating this
                      phenomenon have assumed a perfectly dipolar magnetic field
                      structure with a near-field plasma distribution fixed to the
                      minimal charge-separated force-free configuration. While
                      this may be a reasonable treatment for the closed field
                      lines of conventional radio pulsars, the strong magnetic
                      fields around magnetars are believed to host processes that
                      drive strong deviations from this minimal configuration. In
                      this work, we study how realistic magnetar magnetospheres
                      impact the electromagnetic emission produced from axion dark
                      matter. Specifically, we construct charge and current
                      distributions that are consistent with magnetar observations
                      and use these to recompute the prospective sensitivity of
                      radio and submillimeter telescopes to axion dark matter. We
                      demonstrate that the two leading models yield vastly
                      different predictions for the frequency and amplitude of the
                      spectral line, indicating systematic uncertainties in the
                      plasma structure are significant. Finally, we discuss
                      various observational signatures that can be used to
                      differentiate the local plasma loading mechanism of an
                      individual magnetar, which will be necessary if there is
                      hope of using such objects to search for axions.},
      cin          = {T},
      ddc          = {530},
      cid          = {I:(DE-H253)T-20120731},
      pnm          = {DFG project G:(GEPRIS)390833306 - EXC 2121: Das
                      Quantisierte Universum II (390833306) / 611 - Fundamental
                      Particles and Forces (POF4-611)},
      pid          = {G:(GEPRIS)390833306 / G:(DE-HGF)POF4-611},
      experiment   = {EXP:(DE-MLZ)NOSPEC-20140101},
      typ          = {PUB:(DE-HGF)16},
      eprint       = {2505.20450},
      howpublished = {arXiv:2505.20450},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:2505.20450;\%\%$},
      doi          = {10.1103/glnt-t93q},
      url          = {https://bib-pubdb1.desy.de/record/646139},
}