In this contribution, we introduce subluminal Lorentz invariance violation (LIV) in the propagation of ultra-high energy photons. The energy threshold and the mean free path for the pair production considering LIV are calculated. The influence of the models for the sources of ultrahigh energy cosmic rays in the flux of GZK photons is discussed. The resulting fluxes for several sources models and LIV scenarios are obtained and compared to the upper limits on the photon flux from the Pierre Auger Observatory. Updated limits on the LIV coefficient of the order of d?0 & -10-20, d?1 & -10-38 eV and d?2 & -10-56 eV2 are imposed for the reference case. The possibility of testing superluminal LIV effects is also discussed.
|Title of host publication||Competitive subluminal LIV limits from ultra-high energy astrophysics|
|Publication status||Published - 2019|
|Event||36th International Cosmic Ray Conference, ICRC 2019 - Madison, United States|
Duration: 24 Jul 2019 → 1 Aug 2019
|Name||Proceedings of Science|
|Publisher||Sissa Medialab Srl|
|Conference||36th International Cosmic Ray Conference, ICRC 2019|
|Period||24/7/19 → 1/8/19|
Bibliographical noteFunding Information:
We acknowledge the support from Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) through grants 2015/15897-1, 2016/24943-0, 2017/03680-3 and 2019/01653-4. We also acknowledge the National Laboratory for Scientific Computing (LNCC/MCTI, Brazil) for providing HPC resources of the SDumont supercomputer, which have contributed to the research results reported within this paper (sdumont.lncc.br).
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