CTA sensitivity for probing cosmology and fundamental physics with gamma rays

I. Vovk, J. Biteau, H. Martinez-Huerta, M. Meyer, S. Pita, on behalf of the CTA Consortium

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The Cherenkov Telescopic Array (CTA), the next-generation ground-based gamma-ray observatory, will have unprecedented sensitivity, providing answers to 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 on 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 the 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.

Original languageEnglish
Title of host publicationProceedings of Science
Subtitle of host publication37th International Cosmic Ray Conference (ICRC 2021)
PublisherSissa Medialab, SRL
Number of pages13
Publication statusPublished - 18 Mar 2022
EventInternational Cosmic Ray Conference 2021 - Online, Germany
Duration: 12 Jul 202123 Jul 2021
Conference number: 37th

Publication series

NameProceedings of Science
PublisherSissa Medialab, SRL
ISSN (Print)1824-8039


ConferenceInternational Cosmic Ray Conference 2021
Abbreviated titleICRC 2021
OtherThe ICRC Conference Series has been organised biennially since 1947 under the auspices of the International Union of Pure and Applied Physics (IUPAP) and is the largest conference on Astroparticle Physics, bringing together the different topics of the field.

The main topics are Cosmic Ray Physics, Gamma-Ray Astronomy, Neutrino Astronomy & Neutrino Physics, Dark Matter Physics and Solar and Heliospheric Physics. Additional new topics in the 2021 conference are Multi-messenger Astronomy and Outreach & Education. Broad reviews and recent scientific results, related theory and modelling, experimental methods, techniques and instrumentation will be presented. The ICRC 2021 will be a prime forum to learn about news and developments in Astroparticle Physics and to appreciate the links between its topics.

The conference is jointly organised by the Local Organising Committee (LOC) with representatives of DESY and other German research labs and universities active in Astroparticle Physics, an independent International Scientific Program Committee (ISPC) and the IUPAP Commission C4 (Astroparticle Physics) as International Advisory Committee (IAC) .

Due to the COVID-19 pandemic, this ICRC, originally planned for Berlin, Germany, is being organized as an online conference.
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