Cosmic infrared background excess from axion-like particles and
  implications for multi-messenger observations of blazars
  The first measurement of the diffuse background spectrum at 0.8-1.7 $\mu
\rm{m}$ from the CIBER experiment has revealed a significant excess of the
cosmic infrared background (CIB) radiation compared to the theoretically
expected spectrum. We revisit the hypothesis that decays of axionlike particle
(ALP) can explain this excess, extending previous analyses to the case of a
warm relic population. We show that such a scenario is not excluded by
anisotropy measurements nor by stellar cooling arguments. Moreover, we find
that the increased extragalactic background light (EBL) does not contradict
observations of blazar spectra. Furthermore, the increased EBL attenuates the
diffuse TeV gamma-ray flux and alleviates the tension between the detected
neutrino and gamma ray fluxes.
