De_Angelis_Alessandro.pdf

1. If c e < c => decay -> e + e - kinematically allowed for gamma with
energies above
E max = m e sqrt(2/abs())
- E > 100 TeV => abs() < 5 x 10 -17
2. If >0 => c e > c => electrons become superluminal for energies larger than
E max /sqrt(2) => Vacuum Cherenkov Radiation.
- E e > 2 TeV from cosmic electron radiation => abs() < 2 x 10 -14
- Modification of -> e+e- threshold. Using Mkn 501 and Mkn 421
spectra observations up to E g > 20 TeV
=> abs() < 1.3 x 10 -15
From MAGIC Mkn501 (taken as a LIV signal): || ~ 2 10 -15