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

Kalashev, Oleg E.; Kusenko, Alexander; Vitagliano, Edoardo

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

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Kalashev, Oleg E.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Kusenko, Alexander
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Vitagliano, Edoardo
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

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Kalashev, O. E., Kusenko, A., & Vitagliano, E. (2019). Cosmic infrared background excess from axion-like particles and implications for multi-messenger observations of blazars. Physical Review D, 99, 023002. Retrieved from https://publications.mppmu.mpg.de/?action=search&mpi=MPP-2018-213.

Cite as: https://hdl.handle.net/21.11116/0000-0005-D7BD-4

Abstract

The first measurement of the diffuse background spectrum at 0.8-1.7 $μ \rm{m}$ 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.