Is the Universe transparent to TeV photons?

Details Is the Universe transparent to TeV photons? Is the Universe transparent to TeV photons?

1999-05-26

arxiv.org/abs/astro-ph/9905308v1

Astronomy and Astrophysics

Astrophysics

To appear in 8th Internatinal Workshop on "Neutrino Telescopes", Milla Baldo Ceolin ed., held February 23-26, 1999, in Venice.

Scientific paper

If Lorentz invariance is broken at an energy scale Eq, as has recently been suggested in the context of attempts to quantize gravity, the kinematics of photon-photon collisions would be profoundly affected at lower energies. Specifically, electron-positron pair creation on soft photons may be forbidden at photon energies as low as 30 TeV times square root of (Eq/10**17 GeV) and the Universe would then be transparent to high energy photons. The proposition that Lorentz invariance is broken may be falsified by the techniques of TeV astronomy.

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