ar X iv : h ep - p h / 04 07 36 3 v 1 3 0 Ju l 2 00 4 Violation of Lorentz invariance and dynamical effects in high energy gamma rays

ar X iv : h ep - p h / 03 07 16 1 v 1 1 1 Ju l 2 00 3 Tests of Lorentz and CPT Invariance in Space ∗

I give a brief overview of recent work concerning possible signals of Lorentz violation in sensitive clock-based experiments in space. The systems under consideration include atomic clocks and electromagnetic resonators of the type planned for flight on the International Space Station.

X iv : a st ro - p h / 04 07 31 1 v 1 1 5 Ju l 2 00 4 Ultrahigh Energy Cosmic Rays : Old Physics or New Physics ?

We consider the advantages of and the problems associated with hypotheses to explain the origin of ultrahigh energy cosmic rays (UHECR: E > 10 EeV) and the " trans-GZK " cosmic rays (TGZK: E > 100 EeV) both through " old physics " (acceleration in cosmic sources) and " new physics " (new particles, topological defects, fat neutrino cross sections, Lorentz invariance violation).

ar X iv : h ep - t h / 06 04 16 4 v 4 3 0 Ju n 20 06 On the consistency of Lorentz invariance violation in QED induced by fermions in constant axial – vector background

We show for the first time that the induced parity–even Lorentz invariance violation can be unambiguously calculated in the physically justified and minimally broken dimensional regularization scheme, suitably tailored for a spontaneous Lorentz symmetry breaking in a field theory model. The quantization of the Lorentz invariance violating quantum electrodynamics is critically examined and shown...

ar X iv : h ep - t h / 06 04 16 4 v 3 1 M ay 2 00 6 On the consistency of Lorentz invariance violation in QED induced by fermions in constant axial – vector background

We show that the induced parity–even Lorentz invariance violation can be unambiguously calculated in the physically justified and minimally broken dimensional regularization scheme, suitably tailored for a spontaneous Lorentz symmetry breaking in a field theory model. The quantization of the Lorentz invariance violating quantum electrodynamics is briefly examined and shown to be consistent eith...

ar X iv : h ep - p h / 04 05 11 9 v 1 1 3 M ay 2 00 4 The Lorentz and CPT violating effects on the charged