Constraining axionlike particles using the distance-duality relation
  One of the fundamental results used in observational cosmology is the
distance duality relation (DDR), which relates the luminosity distance, $D_L$,
with angular diameter distance, $D_A$, at a given redshift $z$. We employ the
observed limits of this relation to constrain the coupling of axion like
particles (ALPs) with photons. With our detailed $3D$ ALP-photon mixing
simulation in standard $\Lambda$CDM universe and latest DDR limits observed in
Holand \& Barros (2016) we limit the coupling constant $g_{\phi}\le 6 \times
10^{-13} GeV^{-1}\left(\frac{nG}{\langle B \rangle_{\rm Mpc}}\right)$ for ALPs
of mass $\le 10^{-15}$ eV. The DDR observations can provide very stringent
constraint on ALPs mixing in future. Also any deviation in DDR can be
conventionally explained as photons decaying to axions or vice-versa.
