THE UNBEARABLE BEINGNESS OF LIGHT — Dressingand Undressing Photonsin Black Hole Spacetimes
2012 ◽
Vol 21
(11)
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pp. 1241003
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Keyword(s):
Gravitational tidal forces acting on the virtual e+e- cloud surrounding a photon endow spacetime with a nontrivial 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.
Keyword(s):
2001 ◽
Vol 10
(04)
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pp. 529-538
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Keyword(s):
2020 ◽
Vol 1690
◽
pp. 012181
2013 ◽
Vol 438
(1)
◽
pp. 657-662
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Keyword(s):
2005 ◽
Vol 23
(2)
◽
pp. 555-568
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