“Faster than light” photons and rotating black holes

Daniels, Rob; Shore, Graham M.

doi:10.1016/0370-2693(95)01468-3

Cited by 62 publications

(115 citation statements)

References 16 publications

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“…This concept has gained a central role in the discussion of the propagation of photons in non-linear electrodynamics. In particular, we stress that "anomalous" (c photon > c gravity ) photon speeds have been calculated in relation with the propagation of light in the Casimir vacuum [20][21][22], as well as in gravitational fields [23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Geometrodynamics of variable-speed-of-light cosmologies

et al. 2000

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Physical Review D, in pressThis paper is dedicated to the memory of Dennis SciamaVariable-Speed-of-Light (VSL) cosmologies are currently attracting interest as an alternative to inflation. We investigate the fundamental geometrodynamic aspects of VSL cosmologies and provide several implementations which do not explicitly break Lorentz invariance (no "hard" breaking). These "soft" implementations of Lorentz symmetry breaking provide particularly clean answers to the question "VSL with respect to what?". The class of VSL cosmologies we consider are compatible with both classical Einstein gravity and low-energy particle physics. These models solve the "kinematic" puzzles of cosmology as well as inflation does, but cannot by themselves solve the flatness problem, since in their purest form no violation of the strong energy condition occurs. We also consider a heterotic model (VSL plus inflation) which provides a number of observational implications for the low-redshift universe if χ contributes to the "dark energy" either as CDM or quintessence. These implications include modified gravitational lensing, birefringence, variation of fundamental constants and rotation of the plane of polarization of light from distant sources.

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Section: Introductionmentioning

confidence: 99%

Geometrodynamics of variable-speed-of-light cosmologies

et al. 2000

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“…They showed that in general it is possible to find directions and polarisations for which the photon velocity exceeds the fundamental constant c. This work has subsequently been generalised to other examples of background spacetimes, including Reissner-Nordstrom and Kerr black holes [2,3]. In ref.…”

Section: Introductionmentioning

confidence: 88%

Accelerating photons with gravitational radiation

Shore¹

2001

Nuclear Physics B

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The nature of superluminal photon propagation in the gravitational field describing radiation from a time-dependent, isolated source (the Bondi-Sachs metric) is considered in an effective theory which includes interactions which violate the strong equivalence principle. Such interactions are, for example, generated by vacuum polarisation in conventional QED in curved spacetime. The relation of the resulting light-cone modifications to the Peeling Theorem for the Bondi-Sachs spacetime is explained.

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“…3 Just as in the QED case, the result can be stated as a curvature induced contribution to the refractive index for graviton propagation along the geodesic γ, 12) to O(G eff ). The result is actually simpler than the QED case in (1.3) since the result is diagonal in the 2-dimensional polarization space.…”

Section: The Gravitational Drummond-hathrell Effectmentioning

confidence: 99%

Graviton propagation and vacuum polarization in curved space

Stanley

Hollowood

2011

J. High Energ. Phys.

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The effects of vacuum polarization arising from loops of massive scalar particles on graviton propagation in curved space are considered. Physically, they are due to curvature induced tidal forces acting on the cloud of virtual scalar particles surrounding the graviton. The effects are tractable in a WKB and large mass limit and the results can be written as an effective refractive index for the graviton modes with both a real and imaginary part. The imaginary part of the refractive index is a curvature induced contribution to the wavefunction renormalization of the graviton in real affine time and can have the effect of dressing or un-dressing the graviton. The real part of the refractive index increases logarithmically at high frequency as long as the null energy condition is satisfied by the background.

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“Faster than light” photons and rotating black holes

Cited by 62 publications

References 16 publications

Geometrodynamics of variable-speed-of-light cosmologies

Geometrodynamics of variable-speed-of-light cosmologies

Accelerating photons with gravitational radiation

Graviton propagation and vacuum polarization in curved space

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