Energy-momentum uncertainties as possible origin of threshold anomalies in UHECR and TeV-gamma ray events

Details Energy-momentum uncertainties as possible origin of threshold anomalies in UHECR and TeV-gamma ray events Energy-momentum uncertainties as possible origin of threshold anomalies in UHECR and TeV-gamma ray events

2000-10-15

arxiv.org/abs/hep-ph/0010152v2

Phys.Lett. B507 (2001) 236-240

Physics

High Energy Physics

High Energy Physics - Phenomenology

minor changes in text and references

Scientific paper

10.1016/S0370-2693(01)00436-1

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.

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