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Article overview
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Semianalytical estimates of scattering thresholds and gravitational radiation in ultrarelativistic black hole encounters | | Emanuele Berti
; Vitor Cardoso
; Tanja Hinderer
; Madalena Lemos
; Frans Pretorius
; Ulrich Sperhake
; Nicolas Yunes
; | | Date: |
3 Mar 2010 | | Abstract: | Ultrarelativistic collisions of black holes are ideal gedanken experiments to
study the nonlinearities of general relativity. In this paper we use
semianalytical tools to better understand the nature of these collisions and
the emitted gravitational radiation. We explain many features of the energy
spectra extracted from numerical relativity simulations using two complementary
semianalytical calculations. In the first calculation we estimate the radiation
by a "zero-frequency limit" analysis of the collision of two point particles
with finite impact parameter. In the second calculation we replace one of the
black holes by a point particle plunging with arbitrary energy and impact
parameter into a Schwarzschild black hole, and we explore the multipolar
structure of the radiation paying particular attention to the near-critical
regime. We also use a geodesic analogy to provide qualitative estimates of the
dependence of the scattering threshold on the black hole spin and on the
dimensionality of the spacetime. | | Source: | arXiv, 1003.0812 | | Services: | Forum | Review | PDF | Favorites | |
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