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The Unbearable Beingness of Light - dressing and undressing photons in black hole spacetimes / Timothy J Hollowood; Graham Shore

Int. J. Mod. Phys. D, Volume: 21, Pages: 1241003 - 1241010

Swansea University Author: Graham, Shore

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DOI (Published version): 10.1142/S0218271812410039

Abstract

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 amplificati...

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Published in: Int. J. Mod. Phys. D
Published: World Scientific 2012
URI: https://cronfa.swan.ac.uk/Record/cronfa7968
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Abstract: 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.
Item Description: Awarded 3rd Prize in the Gravity Research Foundation 2012 Awards for Essays on Gravitation.
College: College of Science
Start Page: 1241003
End Page: 1241010