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Sensitivity of the Cherenkov Telescope Array for probing cosmology and fundamental physics with gamma-ray propagation
North West Univ, South Africa.
Univ Tokyo, Japan.
Univ Paris Saclay, France.
Univ Durham, UK.
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Number of Authors: 4962021 (English)In: Journal of Cosmology and Astroparticle Physics, E-ISSN 1475-7516, no 2, article id 048Article in journal (Refereed) Published
Abstract [en]

The Cherenkov Telescope Array (CTA), the new-generation ground-based observatory for gamma-ray astronomy, provides unique capabilities to address significant open questions in astrophysics, cosmology, and fundamental physics. We study some of the salient areas of gamma-ray 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 gamma-ray absorption on the extragalactic background light with a statistical uncertainty below 15% up to a redshift z = 2 and to constrain or detect gamma-ray 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 gamma-ray 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 gamma-ray cosmology.

Place, publisher, year, edition, pages
Institute of Physics Publishing (IOPP), 2021. no 2, article id 048
Keywords [en]
active galactic nuclei, gamma ray experiments, axions, extragalactic magnetic fields
National Category
Astronomy, Astrophysics and Cosmology
Research subject
Physics, Astroparticle Physics
Identifiers
URN: urn:nbn:se:lnu:diva-101999DOI: 10.1088/1475-7516/2021/02/048ISI: 000625299600006Scopus ID: 2-s2.0-85103064424Local ID: 2021OAI: oai:DiVA.org:lnu-101999DiVA, id: diva2:1542778
Available from: 2021-04-08 Created: 2021-04-08 Last updated: 2023-03-28Bibliographically approved

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Becherini, YvonnePunch, Michael

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