3 years ago

Cosmic infrared background excess from axion-like particles, and implications for multi-messenger observations of blazars.

Alexander Kusenko, Oleg E. Kalashev, Edoardo Vitagliano

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 axion-like particle (ALP) can explain this excess. We show that the increased Extragalactic Background Light (EBL) does not contradict observations of blazar spectra and time variability. Furthermore, the increased EBL attenuates the diffuse TeV gamma-ray flux and alleviates the tension between the detected neutrino and gamma ray fluxes.

Publisher URL: http://arxiv.org/abs/1808.05613

DOI: arXiv:1808.05613v1

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