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Why the universe is unexpectedly transparent to very high energy gamma rays
(Sissa Medialab, 2017)
Recent observations of distant gamma ray sources indicate that the universe may be more transparent to VHE-gamma-rays than expected. In this paper we study the reduction of the EBL gamma-gamma opacity due to the existence ...
The effects of EBL inhomogeneity on the gamma-gamma absorption of VHE gamma-rays
(HEASA, 2016)
Very High Energy Gamma Rays (VHE; more than 100 GeV) from Cosmological Gamma Ray
Sources such as blazars can be absorbed by the Extragalactic Background light (EBL), which
leads to a high-energy cut-off in blazar spectral ...
EBL inhomogeneity and hard-spectrum gamma-ray sources
(IOP Publishing, 2017)
The unexpectedly hard very-high-energy (VHE; E > 100 GeV) γ-ray spectra of a few distant blazars have been interpreted as evidence of a reduction of the γγ opacity of the universe due to the interaction of VHE γ-rays with ...
Lorentz invariance violation effects on gamma-gamma absorption and compton scattering
(IOP Publishing, 2018)
In this paper, we consider the impact of the Lorentz invariance violation (LIV) on the γ − γ opacity of the universe to very high energy (VHE) gamma-rays, compared to the effect of local underdensities (voids) of the ...