Can light signals travel faster than c in nontrivial vacua in flat space-time? Relativistic causality II

@article{Fearn2007CanLS,
  title={Can light signals travel faster than c in nontrivial vacua in flat space-time? Relativistic causality II},
  author={Heidi Fearn},
  journal={Laser Physics},
  year={2007},
  volume={17},
  pages={695-699}
}
  • H. Fearn
  • Published 1 May 2007
  • Physics
  • Laser Physics
In this paper, we show that the Scharnhorst effect (vacuum with boundaries or a Casimir-type vacuum) cannot be used to generate signals showing measurable faster-than-c speeds. Furthermore, we aim to show that the Scharnhorst effect would violate special relativity, by allowing for a variable speed of light in a vacuum, unless one can specify a small invariant length scale. This invariant length scale would be agreed upon by all inertial observers. We hypothesize the approximate scale of the… 

References

SHOWING 1-10 OF 73 REFERENCES
Testable scenario for relativity with minimum length
Abstract I propose a general class of spacetimes whose structure is governed by observer-independent scales of both velocity ( c ) and length (Planck length), and I observe that these spacetimes can
Dispersion Relations and Relativistic Causality
In this paper we show that if the refractive index, or rather (n(w) -1) satisfies the dispersion relations then, it is implied by Titchmarsh's theorem that n(w) -> 1 as w -> infinity. Any other
The velocities of light in modified QED vacua
QED vacua under the influence of external conditions (background fields, finite temperature, boundary conditions) can be considered as dispersive media whose complex behaviour can no longer be
Gain-assisted superluminal light propagation
TLDR
Gain-assisted linear anomalous dispersion is used to demonstrate superluminal light propagation in atomic caesium gas and is observed to be a direct consequence of classical interference between its different frequency components in an anomalously dispersion region.
On propagation of light in the vacuum between plates
QED is considered in the presence of two parallel plates (Casimir effect type configuration) imposing boundary conditions on the photon vacuum fluctuations. Two-loop corrections arising from the
Lorentz invariance with an invariant energy scale.
We propose a modification of special relativity in which a physical energy, which may be the Planck energy, joins the speed of light as an invariant, in spite of a complete relativity of inertial
Use of Causality Conditions in Quantum Theory
The limitations on scattering amplitudes imposed by causality requirements are deduced from the demand that the commutator of field operators vanish if the operators are taken at points with
Causality between conducting plates
Abstract A two-loop QED effect, uncovered by Scharnhorst, causes the phase and group velocities of an electromagnetic wave with ω ⪡ m e to slightly exceed c , when the wave is travelling in vacuo
Signal velocity, causality, and quantum noise in superluminal light pulse propagation.
TLDR
This work considers pulse propagation in a linear anomalously dispersive medium where the group velocity exceeds the speed of light in vacuum or even becomes negative, and finds that quantum fluctuations limit the signal velocity to values less than c.
Faster Than $c$ Light Between Parallel Mirrors: The Scharnhorst Effect Rederived
Abstract At frequencies far below the electron mass, the well-established Euler-Heisenberg interaction assigns to the vacuum an intensity-proportional and nondispersive refractive index. But (as
...
1
2
3
4
5
...