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The Unbearable Beingness of Light, Dressing and Undressing Photons in Black Hole Spacetimes

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arxiv 1205.3291 v1 pith:PN2YHDKD submitted 2012-05-15 hep-th gr-qc

Timothy J. Hollowood , Graham M. Shore This is my paper · ORCID
classification hep-thgr-qc
keywords photonapparentblackgravitationalholeviolationactingamplification
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Gravitational tidal forces acting on the virtual e+ e- cloud surrounding a photon endow spacetime with a non-trivial refractive index. This has remarkable properties unique to gravitational theories including superluminal low-frequency propagation, in apparent violation of causality, and amplification of the renormalized photon field, in apparent violation of unitarity. Using the geometry of null congruences and the Penrose limit, we illustrate these phenomena and their resolution by tracing the history of a photon as it falls into the near-singularity region of a black hole.

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Cited by 1 Pith paper

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  1. The Speed of Gravity

    hep-th 2019-09 conditional novelty 6.0 of 10

    In the standard effective field theory of gravity, gravitational waves on cosmological backgrounds propagate at a speed differing from unity, and analyticity arguments favor superluminal speed relative to matter.

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