Probing cosmological anisotropies with gamma-ray sources

The interaction of extragalactic gamma-rays and the extragalactic background light (EBL) triggers electromagnetic cascades, which lead to measurable imprints in the spectra of distant gamma-ray sources. These sources have been proven to be effective probes to measure the EBL spectrum from infrared to UV, and to constrain the intensity of the intergalactic magnetic field (IGMF).

However, the large-scale anisotropies of these fields linked to the filamentary structure of the cosmos have so far remained an uncharted territory.  In this presentation, I will show how the new era of large extragalactic surveys in optical and gamma-rays allows us to provide new constraints on the anisotropies of the universe, and promises their accurate measurements in the near future.