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Conversion of Dark matter axions to photons in magnetospheres of neutron stars
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abstract
We propose a new method to detect observational appearance of Dark Matter axions. The method utilizes observations of neutron stars (NSs) in radio. It is based on the conversion of axions to photons in strong magnetic fields of NSs (Primakoff effect). Whether the conversion takes place, the radio spectrum of the object would have a very distinctive feature -- a narrow spike at a frequency corresponding to the rest mass of the axion. For example, if the coupling constant of the photon-axion interaction is $M=10^{10}$ GeV, the density of Dark Matter axions is $\rho=10^{-24} {\rm g cm^{-3}}$, and the axion mass is $5 {\rm \mu eV}$, then a flux from a strongly magnetized ($10^{14}$ G) NS at the distance 300 pc from the Sun is expected to be about few tenths of mJy at the frequency $\approx 1200$ MHz in the bandwidth $\approx 3$ MHz. Close-by X-ray dim isolated neutron stars are proposed as good candidates to look for such radio emission.
Forward citations
Cited by 6 Pith papers
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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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Gamma Rays from ALP-Photon Conversion and Inverse Compton Reprocessing in Neutron Star Magnetospheres
ALP-to-photon conversion near four pulsars produces mostly sub-MeV emission: Fermi-LAT is insensitive to the channel, COMPTEL data already exclude new parameter space at high ALP mass, and COSI could probe much more.
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Dipole Radiation and Kinetic Mixing from Dark Photon Solitons
Dark photon solitons emit photons through external-field dipole radiation and kinetic mixing, offering a novel astrophysical signature for wave-like dark matter.
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Low-frequency radio telescopes sensitivity to light dark matter
The study calculates sensitivity of space- and Moon-based radio telescopes to resonant light dark matter conversion in solar system targets, finding encouraging prospects for dark photon searches with the Sun and axio...
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Probing the Fundamental Nature of Particle Dark Matter
Review summarizing radio searches for WIMP and ALP dark matter with SKA precursors and forecasts for SKA-Low and SKA-Mid telescopes.
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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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