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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References

SHOWING 1-10 OF 48 REFERENCES
Revisiting event horizon finders
Event horizons are the defining physical features of black hole spacetimes, and are of considerable interest in studying black hole dynamics. Here, we reconsider three techniques to find event
Asymmetric merger of black holes
We study event horizons of non-axisymmetric black holes and show how features found in axisymmetric studies of colliding black holes and of toroidal black holes are non-generic and how new features
Exact solutions for the intrinsic geometry of black hole coalescence
We describe the null geometry of a multiple black hole event horizon in terms of a conformal rescaling of a flat space null hypersurface. For the prolate spheroidal case, we show that the method
Seeking for toroidal event horizons from initially stationary BH configurations
We construct and evolve non-rotating vacuum initial data with a ring singularity, based on a simple extension of the standard Brill?Lindquist multiple BH initial data, and search for event horizons
Finding black holes in numerical spacetimes.
TLDR
A numerical code is constructed that finds black hole event horizons in an axisymmetric rotating spacetime and solves the geodesic equation for light rays emitted from a suitable sample of points in the evolving spacetime.
Momentum flow in black-hole binaries. II. Numerical simulations of equal-mass, head-on mergers with antiparallel spins
Research on extracting science from binary-black-hole (BBH) simulations has often adopted a “scattering matrix” perspective: given the binary’s initial parameters, what are the final hole’s
The status of black-hole binary merger simulations with numerical relativity
The advent of long-term stability in numerical relativity has yielded a windfall of answers to long-standing questions regarding the dynamics of space-time, matter, and electromagnetic fields in the
Black holes in general relativity
It is assumed that the singularities which occur in gravitational collapse are not visible from outside but are hidden behind an event horizon. This means that one can still predict the future
Simulations of Binary Black Hole Mergers Using Spectral Methods
Several improvements in numerical methods and gauge choice are presented that make it possible now to perform simulations of the merger and ringdown phases of ``generic'' binary black hole evolutions
Black-hole binaries, gravitational waves, and numerical relativity
Understanding the predictions of general relativity for the dynamical interactions of two black holes has been a long-standing unsolved problem in theoretical physics. Black-hole mergers are
...
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