Lorentz-violation-induced vacuum birefringence and its astrophysical consequences
Lorentz-violation-induced vacuum birefringence and its astrophysical consequences
In the electromagnetism of loop quantum gravity, two helicities of a photon have different phase velocities and group velocities, termed as ``vacuum birefringence''. Two novel phenomenons, ``peak doubling'' and ``depolarization'', are expected to appear for a linearly polarized light from astrophysical sources. We show that the criteria to observe these …