Sensitivity of the Cherenkov Telescope Array for probing cosmology and fundamental physics with gamma-ray propagation

The Cherenkov Telescope Array Consortium, Jonathan Biteau, Julien Lefaucheur, Manuel Meyer, H. Martínez-Huerta, Santiago Pita, Ievgen Vovk

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

The Cherenkov Telescope Array (CTA), the new-generation ground-based observatory for γ astronomy, provides unique capabilities to address significant open questions in astrophysics, cosmology, and fundamental physics. We study some of the salient areas of γ cosmology that can be explored as part of the Key Science Projects of CTA, through simulated observations of active galactic nuclei (AGN) and of their relativistic jets. Observations of AGN with CTA will enable a measurement of γ absorption on the extragalactic background light with a statistical uncertainty below 15% up to a redshift z=2 and to constrain or detect γ halos up to intergalactic-magnetic-field strengths of at least 0.3 pG . Extragalactic observations with CTA also show promising potential to probe physics beyond the Standard Model. The best limits on Lorentz invariance violation from γ astronomy will be improved by a factor of at least two to three. CTA will also probe the parameter space in which axion-like particles could constitute a significant fraction, if not all, of dark matter. We conclude on the synergies between CTA and other upcoming facilities that will foster the growth of γ cosmology.

Original languageEnglish
Article number048
JournalJournal of Cosmology and Astroparticle Physics
Volume2021
Issue number2
DOIs
Publication statusPublished - Feb 2021
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2021 IOP Publishing Ltd and Sissa Medialab.

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics

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