Toroidal horizons in binary black hole inspirals

@article{Cohen2012ToroidalHI,
  title={Toroidal horizons in binary black hole inspirals},
  author={Michael I. Cohen and Jeffrey D. Kaplan and Mark A. Scheel},
  journal={Physical Review D},
  year={2012},
  volume={85},
  pages={024031}
}
We examine the structure of the event horizon for numerical simulations of two black holes that begin in a quasicircular orbit, inspiral, and finally merge. We find that the spatial cross section of the merged event horizon has spherical topology (to the limit of our resolution), despite the expectation that generic binary black hole mergers in the absence of symmetries should result in an event horizon that briefly has a toroidal cross section. Using insight gained from our numerical… 
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