A twist in the geometry of rotating black holes: seeking the cause of acausality

Details A twist in the geometry of rotating black holes: seeking the cause of acausality A twist in the geometry of rotating black holes: seeking the cause of acausality

2007-08-17

arxiv.org/abs/0708.2324v2

Gen.Rel.Grav.40:1809-1823,2008

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

21 pages, 5 figures; replaced to match published version forthcoming in General Relativity and Gravitation

Scientific paper

10.1007/s10714-007-0577-1

We investigate Kerr-Newman black holes in which a rotating charged ring-shaped singularity induces a region which contains closed timelike curves (CTCs). Contrary to popular belief, it turns out that the time orientation of the CTC is opposite to the direction in which the singularity or the ergosphere rotates. In this sense, CTCs "counter-rotate" against the rotating black hole. We have similar results for all spacetimes sufficiently familiar to us in which rotation induces CTCs. This motivates our conjecture that perhaps this counter-rotation is not an accidental oddity particular to Kerr-Newman spacetimes, but instead there may be a general and intuitively comprehensible reason for this.

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