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We present numerical simulations of a Kerr black hole perturbed by a pulse of ingoing gravitational radiation. For strong perturbations we find up to five concentric marginally outer trapped surfaces....
On the existence of cosmological event horizon
Cosmological horizon strong energy condition positive cosmological constant
2010/3/17
We show that, for general static or axisymmetric stationary spacetimes, a cosmological horizon exists only if $R_{ab}n^{a}n^{b}< 0$ for a hypersurface orthogonal timelike $n^{a}$, at least over some p...