Quantum Gravitational Optics

Details Quantum Gravitational Optics Quantum Gravitational Optics

2003-04-15

arxiv.org/abs/gr-qc/0304059v1

Contemp.Phys. 44 (2003) 503-521

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

28 pages, 5 figures. Review article commissioned by `Contemporary Physics'

Scientific paper

10.1080/00107510310001617106

In quantum theory, the curved spacetime of Einstein's general theory of relativity acts as a dispersive optical medium for the propagation of light. Gravitational rainbows and birefringence replace the classical picture of light rays mapping out the null geodesics of curved spacetime. Even more remarkably, {\it superluminal} propagation becomes a real possibility, raising the question of whether it is possible to send signals into the past. In this article, we review recent developments in the quantum theory of light propagation in general relativity and discuss whether superluminal light is compatible with causality.

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