Journal article 947 views
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...
| Published in: | Int. J. Mod. Phys. D |
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| Published: |
World Scientific
2012
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| 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. |
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| Item Description: |
Awarded 3rd Prize in the Gravity Research Foundation 2012 Awards for Essays on Gravitation. |
| College: |
Faculty of Science and Engineering |
| Start Page: |
1241003 |
| End Page: |
1241010 |