1995/04/25 by G. M. Shore, G.M. Shore · 2 citations
Physics and Astronomy · #Astrophysical Phenomena and Observations #Black Holes and Theoretical Physics #Causality (physics) #Classical mechanics #Event horizon #Gravitation #Photon #Physics #Pulsar #Pulsars and Gravitational Waves Research #Quantum electrodynamics #Quantum mechanics #Spacetime #Superluminal motion #Theoretical physics #gr-qc #hep-ph
paper · pdf · doi:10.1016/0550-3213(95)00646-x
published as Nucl.Phys. B460 (1996) 379-396 · 15 pages, Plain TeX
arxiv created 1995/04/25 · openalex publication_date 1996/02/01 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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 exposed.