Sensitivity of the Cherenkov Telescope Array for probing cosmology and fundamental physics with gamma-ray propagation
Langue
en
Article de revue
Ce document a été publié dans
JCAP. 2021, vol. 02, p. 048
Résumé en anglais
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 ...Lire la suite >
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.< Réduire
Mots clés en anglais
gamma ray experiments
axions
extragalactic magnetic fields
gamma ray: propagation
invariance: Lorentz
violation: Lorentz
jet: relativistic
Cherenkov Telescope Array
cosmological model: parameter space
AGN
axion-like particles
observatory
sensitivity
new physics
statistical
background
absorption
redshift: dependence
dark matter: halo
active galactic nuclei
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