Mathematics – Logic
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012hell.conf....2e&link_type=abstract
10th Hellenic Astronomical Conference, Proceedings of the conference held at Ioannina, Greece, 5-8 September 2011. Edited by Io
Mathematics
Logic
Scientific paper
Einstein postulated that "Light always propagates through a vacuum at a definite velocity, c, which is independent of the state of motion of the emitting body". This is the framework of classical special relativity, having no fundamental length-scale associated with it (Lorentz invariance). However, quantum effects at the Planck scale, where gravity becomes a strong force, are expected (although not yet proven) to strongly affect the nature of space-time, causing violations of this invariance. It is believed that such violations can be tested by measuring time-lags between very high energy (VHE) photons (above 100 GeV), emitted simultaneously from distant astrophysical sources, expressing possible variations of photon speed as a function of energy. Since blazars are in relatively cosmological distances and emit variable emission in VHE they are considered ideal candidates to test such deviations. I am going to present the current results on this field which up to now seem to be rather inconclusive.
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