Bonn 2020 – scientific programme

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T: Fachverband Teilchenphysik

T 68: Eingeladene Vorträge (Invited Topical Talks) III

T 68.4: Invited Topical Talk

Thursday, April 2, 2020, 15:30–16:00, H-Aula

Probing cosmic magnetism and fundamental physics with γ-ray propagation — •Manuel Meyer — ECAP, University of Erlangen-Nuremberg, Erlangen, Germany

The observation of high-energy γ rays produced in distant galaxies offers the unique opportunity to search for an intergalactic magnetic field (IGMF) and dark-matter particle candidates. During their propagation, γ rays interact with background radiation fields and produce e⁺e⁻ pairs. These pairs in turn up-scatter photons of the cosmic microwave background to γ-ray energies, initiating a cascade. The morphology of this cascade signal will depend on the IGMF since it deflects the e⁺e⁻ pairs. On the other hand, γ rays could oscillate into axion-like particles (ALPs), leaving distinct features in γ-ray energy spectra. I will review the latest results in the search for an IGMF and ALPs and give an outlook over the capabilities of future γ-ray telescopes.