# Strong equivalence, Lorentz and CPT violation, anti-hydrogen spectroscopy and gamma-ray burst polarimetry☆

@article{Shore2005StrongEL, title={Strong equivalence, Lorentz and CPT violation, anti-hydrogen spectroscopy and gamma-ray burst polarimetry☆}, author={Graham M. Shore}, journal={Nuclear Physics}, year={2005}, volume={717}, pages={86-118} }

Abstract The strong equivalence principle, local Lorentz invariance and CPT symmetry are fundamental ingredients of the quantum field theories used to describe elementary particle physics. Nevertheless, each may be violated by simple modifications to the dynamics while apparently preserving the essential fundamental structure of quantum field theory itself. In this paper, we analyse the construction of strong equivalence, Lorentz and CPT violating Lagrangians for QED and review and propose some…

## 74 Citations

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## References

SHOWING 1-10 OF 98 REFERENCES

Production and detection of cold antihydrogen atoms

- Physics, MedicineNature
- 2002

This work demonstrates the production of antihydrogen atoms at very low energy by mixing trapped antiprotons and positrons in a cryogenic environment and detects the neutral anti-atoms directly when they escape the trap and annihilate, producing a characteristic signature in an imaging particle detector.

Lorentz and CPT violations from Chern-Simons modifications of QED

- Physics
- 2002

The possibility of a small modification of spinor Quantum Electro-Dynamics is reconsidered, in which Lorentz and CPT non-covariant kinetic terms for photons and fermions are present. The…

Signals for Lorentz violation in electrodynamics

- Physics
- 2002

An investigation is performed of the Lorentz-violating electrodynamics extracted from the renormalizable sector of the general Lorentz- and CPT-violating standard-model extension. Among the…

Antihydrogen production and precision experiments

- Physics
- 1996

The study of CPT invariance with the highest achievable precision in all particle sectors is of fundamental importance for physics. Equally important is the question of the gravitational acceleration…

Gravity, Lorentz violation, and the standard model

- Physics
- 2004

The role of the gravitational sector in the Lorentz- and CPT-violating standard-model extension ~SME! is studied. A framework is developed for addressing this topic in the context of Riemann-Cartan…

``Faster than Light'' Photons in Gravitational Fields -- Causality, Anomalies and Horizons

- Physics
- 1996

Abstract A number of general issues relating to superluminal photon propagation in gravitational fields are explored. The possibility of superluminal, yet causal, photon propagation arises because of…

Testing Lorentz invariance by the use of vacuum and matter filled cavity resonators

- Physics
- 2005

We consider tests of Lorentz invariance for the photon and fermion sector that use vacuum and matter-filled cavities. Assumptions on the wave function of the electrons in crystals are eliminated from…

Limits on a Lorentz- and parity-violating modification of electrodynamics.

- Physics, MedicinePhysical review. D, Particles and fields
- 1990

The Chern-Simons Lagrangian would rotate the plane of polarization of radiation from distant galaxies, an effect which is not observed, and the magnitude of the vector is 1.7 times the Hubble constant.

Probing the Planck Scale in Low-Energy Atomic Physics

- Physics
- 2001

Experiments in atomic physics have exceptional sensitivity to small shifts in energy in an atom, ion, or bound particle. They are particularly well suited to search for unique low-energy signatures…

Faster than Light Photons in Gravitational Fields II – Dispersion and Vacuum Polarisation

- Physics
- 2002

Abstract Vacuum polarisation in QED in a background gravitational field induces interactions which effectively violate the strong equivalence principle and affect the propagation of light. In the low…