Comments on ultra-high-energy photons and D-foam models |
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| Authors: | John Ellis Nick E. Mavromatos Dimitri V. Nanopoulos |
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| Affiliation: | 1. CERN, Theory Division, CH 1211 Geneva 23, Switzerland;2. King''s College London, Department of Physics, London WC2R 2LS, United Kingdom;3. George P. and Cynthia W. Mitchell Institute for Fundamental Physics, Texas A&M University, College Station, TX 77843, USA;4. Astroparticle Physics Group, Houston Advanced Research Center (HARC), Mitchell Campus, Woodlands, TX 77381, USA;5. Academy of Athens, Division of Natural Sciences, 28 Panepistimiou Avenue, Athens 10679, Greece |
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| Abstract: | ![]()
We revisit the constraints that the non-observation of ultra-high-energy photons due to the GZK cutoff can impose on models of Lorentz violation in photon propagation, following recent work by Maccione, Liberati and Sigl (2010) [arXiv:1003.5468] that carries further an earlier analysis by the present authors [J. Ellis et al., Phys. Rev. D 63 (2001) 12402, hep-th/0012216]. We argue that the GZK cutoff constraint is naturally evaded in the D-brane model of space–time foam presented recently by the present authors [J. Ellis et al., Phys. Lett. B 665 (2008) 412, arXiv:0804.3566], in which Lorentz-violating effects on photon propagation are independent of possible effects during interactions. We also note a novel absorption mechanism that could provide a GZK-like cutoff for photons in low-scale string models. |
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| Keywords: | String foam High-energy gamma-rays |
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