منابع مشابه
Do single photons tunnel faster than light?
Experiments done with single photons in the early 1990’s produced a surprising result: that single photons pass through a photonic tunnel barrier with a group velocity faster than the vacuum speed of light. This result has stimulated intense discussions related to causality, the speed of information transfer, the nature of barrier tunneling and the meaning of group velocity. The superluminality...
متن کامل\Faster Than Light" Photons in Dilaton Black Hole Spacetimes
We investigate the phenomenon of “faster than light” photons in a family of dilaton black hole spacetimes. For radially directed photons, we find that their light-cone condition is modified even though the spacetimes are spherically symmetric. They also satisfy the “horizon theorem” and the “polarization sum rule” of Shore. For orbital photons, the dilatonic effect on the modification of the li...
متن کامل“ Faster than Light ” Photons and Rotating Black Holes
The effective action for QED in curved spacetime includes equivalence principle violating interactions between the electromagnetic field and the spacetime curvature. These interactions admit the possibility of superluminal yet causal photon propagation in gravitational fields. In this paper, we extend our analysis of photon propagation in gravitational backgrounds to the Kerr spacetime describi...
متن کامل“ Faster than Light ” Photons and Charged Black Holes
Photons propagating in curved spacetime may, depending on their direction and polari-sation, have velocities exceeding the " speed of light " c. This phenomenon arises through vacuum polarisation in QED and is a tidal gravitational effect depending on the local curvature. It implies that the Principle of Equivalence does not hold for interacting quantum field theories in curved spacetime and re...
متن کاملFaster than light?
The hypothesis formulated by Smarandache on the possibility that no barriers exist in the Universe for an object to travel at any speed is here shortly analyzed. In 1980, contrarily to what previously postulated by Einstein, Smarandache, according to the EPR paradox, formulated the hypothesis that no barriers exist in the Universe for an object (or particle or information or energy) to travel a...
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ژورنال
عنوان ژورنال: Nature
سال: 1990
ISSN: 0028-0836,1476-4687
DOI: 10.1038/344289a0