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Constraining the photon coupling of ultra-light dark-matter axion-like particles by polarization variations of parsec-scale jets in active galaxies

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arxiv 1811.10997 v1 pith:AX2K5IW5 submitted 2018-11-27 astro-ph.CO hep-phhep-th

Constraining the photon coupling of ultra-light dark-matter axion-like particles by polarization variations of parsec-scale jets in active galaxies

M.M. Ivanov , Y.Y. Kovalev , M.L. Lister , A.G. Panin , A.B. Pushkarev , T. Savolainen , S.V. Troitsky This is my paper
classification astro-ph.CO hep-phhep-th
keywords particlespolarizationaxion-likeultra-lightactivechangescondensatecoupling
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Ultra-light dark matter may consist of axion-like particles with masses below 10^(-19) eV. Two-photon interactions of these particles affect the polarization of radiation propagating through the dark matter. Coherent oscillations of the Bose condensate of the particles induce periodic changes in the plane of polarisation of emission passing through the condensate. We estimate this effect and analyze MOJAVE VLBA polarization observations of bright downstream features in the parsec-scale jets of active galaxies. Through the non-observation of periodic polarization changes, we are able to constrain the photon coupling of the ultra-light dark-matter axion-like particles at the level of <~ 10^(-12)/GeV for masses between ~5*10^(-23) eV and ~1.2*10^(-21) eV.

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