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Probing Axions with Radiation from Magnetic Stars
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Recent experiments suggest that polarized photons may couple significantly to pseudoscalar particles such as axions. We study the possible observational signatures of axion-photon coupling for radiation from magnetic stars, with particular focus on neutron stars. We present general methods for calculating the axion-photon conversion probability during propagation through a varying magnetized vacuum as well as across an inhomogeneous atmosphere. Partial axion-photon conversion may take place in the vacuum region outside the neutron star. Strong axion-photon mixing occurs due to a resonance in the atmosphere, and depending on the axion coupling strength and other parameters, significant axion-photon conversion can take place at the resonance. Such conversions may produce observable effects on the radiation spectra and polarization signals from the star. We also apply our results to axion-photon propagation in the Sun and in magnetic white dwarfs. We find that there is no appreciable conversion of solar axions to photons during the propagation.
Forward citations
Cited by 6 Pith papers
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A Bandpass Axion Or: How I Learned To Stop Worrying About Stars And Love The Lab
Axion-photon coupling from non-anomalous PQ symmetry with charged light fermions acts as bandpass filter, making lab constraints dominant for most axion masses.
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Time-Domain Axion Searches with Magnetic White Dwarfs
The apparent axion-photon conversion signal in PG 1015+014 TESS data is absorbed by the second harmonic of the star's intrinsic light curve, yielding no evidence for axions and a conservative coupling limit.
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Sideband Structure of Axion Electrodynamics
Introduces a sideband ladder formulation of axion electrodynamics that classifies instabilities and conversion channels via Krein signatures in periodic backgrounds.
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Landau-Zener formula and resonant axion conversion in neutron star magnetospheres
The Landau-Zener approximation for axion-photon conversion in neutron star magnetospheres fails when resonance width exceeds conversion region size, leading to revised axion constraints from optical-band searches.
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Constraining meV Axion Dark Matter with ALMA Observations of the Galactic Center Magnetar SGR 1745-2900
ALMA observations of the magnetar SGR 1745-2900 exclude axion-photon couplings down to ~2e-13 GeV^-1 in the 0.55-0.62 meV mass range, reaching the QCD axion window under a dark-matter spike model.
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Axions as Dark Matter, Dark Energy, and Dark Radiation
A mini-review of axion phenomenology showing how light bosons can account for dark matter, drive cosmic acceleration, or contribute to relativistic backgrounds in the early and late Universe.
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