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Title: The CTA sensitivity to Lorentz-violating effects on the gamma-ray horizon

The arrival of TeV-energy photons from distant galaxies is expected to be affected by their QED interaction with intergalactic radiation fields through electron-positron pair production. In theories where high-energy photons violate Lorentz symmetry, the kinematics of the process γ+γ→e{sup +}+e{sup −} is altered and the cross section suppressed. Consequently, one would expect more of the highest-energy photons to arrive if QED is modified by Lorentz violation than if it is not. We estimate the sensitivity of Cherenkov Telescope Array (CTA) to changes in the gamma-ray horizon of the Universe due to Lorentz violation, and find that it should be competitive with other leading constraints.
Authors:
;  [1] ;  [2] ; ;  [3]
  1. Theoretical Particle Physics and Cosmology Group, Physics Department, King's College London, Strand, London, WC2R 2LS (United Kingdom)
  2. Engineering Physics, Lund University, Sölvegatan 27, Lund (Sweden)
  3. University of Leicester, University Road, Leicester, LE1 7RH (United Kingdom)
Publication Date:
OSTI Identifier:
22373540
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2014; Journal Issue: 06; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; CROSS SECTIONS; ELECTRONS; GALAXIES; GAMMA RADIATION; PAIR PRODUCTION; PHOTONS; POSITRONS; QUANTUM ELECTRODYNAMICS; SENSITIVITY; SYMMETRY; TELESCOPES; TEV RANGE; UNIVERSE