2000/10/24 by Y. Jack Ng, D. -S. Lee, D.-S. Lee +3
Physics and Astronomy · #Anomaly (physics) #Astrophysics and Cosmic Phenomena #Cosmic ray #Energy (signal processing) #Momentum (technical analysis) #Noncommutative and Quantum Gravity Theories #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum mechanics #astro-ph #gr-qc #hep-ph #hep-th
paper · pdf · doi:10.1016/s0370-2693(01)00436-1
published as Phys.Lett. B507 (2001) 236-240 · minor changes in text and references
arxiv created 2000/10/24 · openalex publication_date 2001/05/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
A threshold anomaly refers to a theoretically expected energy threshold that is not observed experimentally. Here we offer an explanation of the threshold anomalies encountered in the ultra-high energy cosmic ray events and the TeV-gamma ray events, by arguing that energy-momentum uncertainties due to quantum gravity, too small to be detected in low-energy regime, can affect particle kinematics so as to raise or even eliminate the energy thresholds. A possible modification of the energy-momentum dispersion relation, giving rise to time-of-flight differences between photons of different energies from gamma ray bursts, is also discussed.