2009/02/05 by Luis Gonzalez‐Mestres, Luis Gonzalez-Mestres · 1 citation
Physics and Astronomy · #Cosmology and Gravitation Theories #Noncommutative and Quantum Gravity Theories #Particle physics theoretical and experimental studies #astro-ph.CO #astro-ph.HE
paper · pdf · doi:10.1016/j.nuclphysbps.2009.03.088
published as Nucl.Phys.Proc.Suppl.190:191-197,2009 · Talk given at the CRIS (Cosmic Ray International Seminar), La Malfa, September 15-19, 2008. To be published in the Proceedings
arxiv created 2009/02/05 · openalex publication_date 2009/05/01 · arxiv updated 2010/12/13 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The implications of AUGER and HiRes results for patterns of Lorentz symmetry violation (LSV) are examined, focusing on weak doubly special relativity (WDSR). If the Greisen-Zatsepin-Kuzmin (GZK) cutoff is definitely confirmed, the mass composition of the highest-energy cosmic-ray spectrum will be a crucial issue to draw precise theoretical consequences from the experimental results. Assuming that the observed flux suppression is due to the GZK mechanism, data will allow in principle to exclude a significant range of LSV models and parameters, but other important possibilities are expected to remain open : Lorentz breaking can be weaker or occur at a scale higher than the Planck scale, unconventional LSV effects can fake the GZK cutoff, threshold phenomena can delay its appearance... Space experiments appear to be needed to further test special relativity. We also examine the consequences of AUGER and HiRes data for superbradyons. If such superluminal ultimate constituents of matter exist in our Universe, they may provide new forms of dark matter and dark energy.