Journal article 915 views
‘Faster than light’ photons in gravitational fields — Causality, anomalies and horizons
G.M. Shore,
Graham Shore
Nuclear Physics B, Volume: "B460", Issue: 2, Pages: 379 - 396
Swansea University Author: Graham Shore
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DOI (Published version): 10.1016/0550-3213(95)00646-X
Abstract
A number of general issues relating to superluminal photon propagation in gravitational fields are explored. The possibility of superluminal, yet causal, photon propagation arises because of Equivalence Principle violating interactions induced by vacuum polarisation in QED in curved spacetime. Two g...
| Published in: | Nuclear Physics B |
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| ISSN: | 05503213 |
| Published: |
1995
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| Online Access: |
Check full text
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa31909 |
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| Abstract: |
A number of general issues relating to superluminal photon propagation in gravitational fields are explored. The possibility of superluminal, yet causal, photon propagation arises because of Equivalence Principle violating interactions induced by vacuum polarisation in QED in curved spacetime. Two general theorems are presented: first, a polarisation sum rule which relates the polarisation averaged velocity shift to the matter energy-momentum tensor and second, a `horizon theorem' which ensures that the geometric event horizon for black hole spacetimes remains a true horizon for real photon propagation in QED. A comparision is made with the equivalent results for electromagnetic birefringence and possible connections between superluminal photon propagation, causality and the conformal anomaly are |
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| College: |
Faculty of Science and Engineering |
| Issue: |
2 |
| Start Page: |
379 |
| End Page: |
396 |