Testing Relativity at High Energies Using Spaceborne Detectors

Details Testing Relativity at High Energies Using Spaceborne Detectors Testing Relativity at High Energies Using Spaceborne Detectors

2006-06-27

arxiv.org/abs/astro-ph/0606641v2

Int.J.Mod.Phys.D16:2343-2355,2008

Astronomy and Astrophysics

Astrophysics

14 pages, Text of invitated talk presented at the "From Quantum to Cosmos: Fundamental Physics Studies from Space" meeting. Mo

Scientific paper

10.1142/S021827180701170X

(ABRIDGED) The Gamma-ray Large Area Space Telescope (GLAST) will measure the spectra of distant extragalactic sources of high energy gamma-rays. GLAST can look for energy dependent propagation effects from such sources as a signal of Lorentz invariance violation (LIV). Such sources should also exhibit high energy spectral cutoffs from pair production interactions with low energy photons. The properties of such cutoffs can also be used to test LIV. Detectors to measure gamma-ray polarization can look for the depolarizing effect of space-time birefingence predicted by loop quantum gravity. A spaceborne detector array looking down on Earth to study extensive air showers produced by ultrahigh energy cosmic rays can study their spectral properties and look for a possible deviation from the predicted GZK effect as another signal of LIV.

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