104 research outputs found
Algebraic Classification of Numerical Spacetimes and Black-Hole-Binary Remnants
In this paper we develop a technique for determining the algebraic
classification of a numerical spacetime, possibly resulting from a generic
black-hole-binary merger, using the Newman-Penrose Weyl scalars. We demonstrate
these techniques for a test case involving a close binary with arbitrarily
oriented spins and unequal masses. We find that, post merger, the spacetime
quickly approaches Petrov type II, and only approaches type D on much longer
timescales. These techniques allow us to begin to explore the validity of the
"no-hair theorem" for generic merging-black-hole spacetimes.Comment: published versio
Orbital Evolution of Extreme-Mass-Ratio Black-Hole Binaries with Numerical Relativity
We perform the first fully nonlinear numerical simulations of black-hole
binaries with mass ratios 100:1. Our technique for evolving such extreme mass
ratios is based on the moving puncture approach with a new gauge condition and
an optimal choice of the mesh refinement (plus large computational resources).
We achieve a convergent set of results for simulations starting with a small
nonspinning black hole just outside the ISCO that then performs over two orbits
before plunging into the 100 times more massive black hole. We compute the
gravitational energy and momenta radiated as well as the final remnant
parameters and compare these quantities with the corresponding perturbative
estimates. The results show a close agreement. We briefly discuss the relevance
of this simulations for Advanced LIGO, third-generation ground based detectors,
and LISA observations, and self-force computations.Comment: 4 pages, 4 figures, 3 tables. Matching published versio
- …