Light Dragging Phenomenon and Expanding Wormholes

Details Light Dragging Phenomenon and Expanding Wormholes Light Dragging Phenomenon and Expanding Wormholes

2009-05-21

arxiv.org/abs/0905.3474v3

Physics

High Energy Physics

High Energy Physics - Theory

9 pages, no figures, title changed, version published in J. Korean Phys. Soc. 57 (3), 419 - 423 (2010)

Scientific paper

The null geodesic congruence for the Lorentzian version of Hawking's wormhole is studied, in spherical Rindler coordinates. One finds that the wormhole throat expands exponentially and the "flare - out" condition is satisfied. A time reversal is equivalent with an inversion applied to the radial coordinate. The stress energy is mostly located near wormhole's throat and the anisotropic fluid is comoving with the spherical distribution of accelerating observers. Far from the throat (the light cone in Cartesian coordinates) the negative energy density acquires an expression similar with the Casimir energy density between two perfectly reflecting plates. We conjecture that the light propagation follows the throat of a preexisting expanding wormhole (a "light dragging" phenomenon).

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