Now showing items 1-2 of 2

    • EBL inhomogeneity and hard-spectrum gamma-ray sources 

      Abdalla, Hassan; Böttcher, Markus (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 

      Abdalla, Hassan; Böttcher, Markus (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 ...