LORENTZ SYMMETRY VIOLATION AT PLANCK SCALE, COSMOLOGY AND SUPERLUMINAL PARTICLES
LORENTZ SYMMETRY VIOLATION AT PLANCK SCALE, COSMOLOGY AND SUPERLUMINAL PARTICLES
Although Lorentz symmetry has been tested at low energy with extremely good accuracy, its validity at very high energy is much less well established. If Lorentz symmetry violation (LSV) is energy-dependent (e.g. $\propto E^2$), it can be of order 1 at Planck scale and undetectable at GeV scale or below. …