A Search for Axionic Dark Matter Using the Magnetar PSR J1745-2900. (arXiv:2008.01877v1 [astro-ph.CO])
<a href="http://arxiv.org/find/astro-ph/1/au:+Darling_J/0/1/0/all/0/1">Jeremy Darling</a>
We report on a search for dark matter axion conversion photons from the
magnetosphere of the Galactic Center magnetar PSR J1745-2900 using spectra
obtained from the Karl G. Jansky Very Large Array. No significant spectral
features are detected. Using a hybrid model for PSR J1745-2900 and canonical
assumptions about the dark matter density profile, we exclude axion models with
axion-photon coupling $g_{agammagamma}$ > 4-20 x 10$^{-12}$ GeV$^{-1}$ with
95% confidence over the mass ranges 4.2-8.4, 18.6-26.9, 33.0-41.4, 53.7-62.1,
and 126.0-159.3 $mu$eV. If there is a dark matter cusp, the limits reduce to
$g_{agammagamma}$ > 4-20 x 10$^{-14}$ GeV$^{-1}$, which overlap some axion
models for the observed mass ranges > 33 $mu$eV. These limits may be improved
by modeling the stimulated emission that can boost the axion-photon conversion
process.
We report on a search for dark matter axion conversion photons from the
magnetosphere of the Galactic Center magnetar PSR J1745-2900 using spectra
obtained from the Karl G. Jansky Very Large Array. No significant spectral
features are detected. Using a hybrid model for PSR J1745-2900 and canonical
assumptions about the dark matter density profile, we exclude axion models with
axion-photon coupling $g_{agammagamma}$ > 4-20 x 10$^{-12}$ GeV$^{-1}$ with
95% confidence over the mass ranges 4.2-8.4, 18.6-26.9, 33.0-41.4, 53.7-62.1,
and 126.0-159.3 $mu$eV. If there is a dark matter cusp, the limits reduce to
$g_{agammagamma}$ > 4-20 x 10$^{-14}$ GeV$^{-1}$, which overlap some axion
models for the observed mass ranges > 33 $mu$eV. These limits may be improved
by modeling the stimulated emission that can boost the axion-photon conversion
process.
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