Motivated by ideas about quantum gravity, a tremendous amount of effort over the past
decade has gone into testing Lorentz invariance in various regimes. This review …

We propose a theoretically consistent modification of gravity in the infrared, which is
compatible with all current experimental observations. This is an analog of the Higgs …

From a direct calculation of the anomalous Hall conductivity and an effective
electromagnetic action obtained via Fujikawa's chiral rotation technique, we conclude that …

In Lorentz violating quantum electrodynamics (QED) it is known that a radiatively induced<?
format?> Chern-Simons term appears in the effective action for the gauge field, which is …

We consider here the possibility of quantum gravity induced violation of Lorentz symmetry
(LV). Even if suppressed by the inverse Planck mass such LV can be tested by current …

We search for signatures of Lorentz and CPT violations in the cosmic microwave
background (CMB) temperature and polarization anisotropies by using the Wilkinson …

The non-minimal coupling of fermions to a background responsible for the breaking of
Lorentz symmetry is introduced in Dirac's equation; the non-relativistic regime is …

We derive the electromagnetic response of a particular fermionic sector in the minimal QED
contribution to the Standard Model Extension (SME), which can be physically realized in …

Abstract The gauge-invariant Chern-Simons-type Lorentz-and CPT-breaking term is here
reassessed and a spin-projector method is adopted to account for the breaking (vector) …

The strong equivalence principle, local Lorentz invariance and CPT symmetry are
fundamental ingredients of the quantum field theories used to describe elementary particle …