Constraints on non-resonant photon-axion conversion from the Planck
  satellite data
  The non-resonant conversion of Cosmic Microwave Background (CMB) photons into
scalar as well as light pseudoscalar particles such as axion-like particles
(ALPs) in the presence of turbulent magnetic fields can cause a unique,
spatially fluctuating spectral distortion in the CMB. We use the publicly
available Planck temperature maps for the frequency channels (70-545 GHz) to
obtain the first ALP distortion map using $45\%$ clean part of the sky. The
$95^{th}$ percentile upper limit on the RMS fluctuation of ALP distortions from
the cleanest part of the CMB sky at $15$ arcmin angular resolution is $18.5
\times 10^{-6}$. The RMS fluctuation in the distortion map is also consistent
with different combinations of frequency channels and sky-fractions.
