Jul 12 – 23, 2021
Europe/Berlin timezone

CTA prospects for probing cosmology and fundamental physics with gamma rays

Jul 16, 2021, 6:00 PM
1h 30m


Talk GAI | Gamma Ray Indirect Discussion


Ievgen Vovk (Institute for Cosmic Ray Research, The University of Tokyo)


The Cherenkov Telescopic Array (CTA), the next-generation ground-based gamma-ray observatory, will have unprecedented sensitivity in the very-high-energy gamma-ray regime, elucidating open questions in gamma-ray cosmology and fundamental physics. Using simulations of active galactic nuclei observations foreseen in the CTA Key Science Program, we find that CTA will measure gamma-ray absorption by the extragalactic background light with a statistical error below 15% up to the redshift of 2 and detect or establish limits on gamma halos induced by an intergalactic magnetic field of at least 0.3 pG. Extragalactic observations using CTA also demonstrate the potential for testing physics beyond the Standard Model. The best state-of-the-art constraints on the Lorentz invariance violation from astronomical gamma-ray observations will be improved at least two- to threefold. CTA will also probe the parameter space where axion-like particles can represent a significant proportion - if not all - of dark matter. Joint multiwavelength and multimessenger observations, carried out together with other future observatories, will further foster the growth of gamma-ray cosmology.


CTA; extragalactic background light; Lorentz invariance violation; intergalactic magnetic field; dark matter

Collaboration CTA
Subcategory Future projects

Primary authors

Ievgen Vovk (Institute for Cosmic Ray Research, The University of Tokyo) Jonathan Biteau (Laboratoire de Physique des 2 Infinis, Irène Joliot-Curie, Université Paris-Saclay, Université de Paris, IN2P3/CNRS, 91405 Orsay, France) Manuel Meyer (Erlangen Center for Astroparticle Physics) Humberto Martínez-Huerta (IFSC - USP) Dr Santiago Pita (APC, CNRS/IN2P3, Université de Paris) For the CTA Consortium

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