Detectability of Space-Time Fluctuations in Ultra High Energy Cosmic Ray Experiments

Details Detectability of Space-Time Fluctuations in Ultra High Energy Cosmic Ray Experiments Detectability of Space-Time Fluctuations in Ultra High Energy Cosmic Ray Experiments

2002-10-17

arxiv.org/abs/astro-ph/0210402v1

Astronomy and Astrophysics

Astrophysics

7 pages, 1 eps figure, talk presented at the Vulcano Workshop 2002

Scientific paper

It is generally expected that quantum gravity affects the structure of space-time by introducing stochastic fluctuations in the geometry, and, ultimately, in the measurements of four-distances and four-momenta.These fluctuations may induce observable consequences on the propagation of ultra high energy particles, mainly in the range of energies of interest for cosmic ray physics, over large distances, leading to their detection or constraining the underlying quantum gravitational structure. We argue that the detectable effects of fluctuations may extend to energies much lower than the threshold for proton photopion production (the so-called GZK cut-off), so that lower energy observations may provide strong constraints on the role of a fluctuating space-time structure.

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