Abstract
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.
Highlights
The Cosmic Infrared Background Experiment (CIBER) collaboration has claimed the detection of an unexpectedly high flux compared to theoretical expectations in the 0.8–1.7 μm range of wavelengths [1]
The axionlike particle (ALP) decay to a photon plus a hidden photon avoids the direct detection bounds on the coupling gaχγ, which instead constraint the gaγγ of standard ALPs,1 as well as astrophysical bounds due to horizontal branch stars and SN1987a [30]; ALPs could still contribute to stellar cooling via plasmon decay γ → a þ χ, which is possible in a medium as the photon dispersion relation allows for such a decay to happen
In this paper we have explored the possibility that the high extragalactic background light (EBL) spectrum detected by the CIBER collaboration could be due to the decay of an axionlike particle with mass around an electronvolt
Summary
The Cosmic Infrared Background Experiment (CIBER) collaboration has claimed the detection of an unexpectedly high flux compared to theoretical expectations in the 0.8–1.7 μm range of wavelengths [1]. This measurement is complementary to other observations in the infrared band like the ones carried by AKARI [2] and IRTS [3]. ALPs as a dark matter candidate have recently received great attention due to the non detection of weakly interactive massive particles [22] It is, important to examine the CIB data in light of the ALP hypothesis. This brings us to a final discussion and our conclusions
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