Can a circulating light beam produce a time machine?

Details Can a circulating light beam produce a time machine? Can a circulating light beam produce a time machine?

2004-10-17

arxiv.org/abs/gr-qc/0410078v1

Found.Phys.Lett. 18 (2005) 379-385

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

5 pages, RevTeX

Scientific paper

10.1007/s10702-005-7127-4

In a recent paper, Mallett found a solution of the Einstein equations in which closed timelike curves (CTC's) are present in the empty space outside an infinitely long cylinder of light moving in circular paths around an axis. Here we show that, for physically realistic energy densities, the CTC's occur at distances from the axis greater than the radius of the visible universe by an immense factor. We then show that Mallett's solution has a curvature singularity on the axis, even in the case where the intensity of the light vanishes. Thus it is not the solution one would get by starting with Minkowski space and establishing a cylinder of light.

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