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Universality, Maximum Radiation, and Absorption in High-Energy Collisions of Black Holes with Spin

Author(s): Sperhake, Ulrich; Berti, Emanuele; Cardoso, Vitor; Pretorius, Frans

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Abstract: We explore the impact of black hole spins on the dynamics of high-energy black hole collisions. We report results from numerical simulations with gamma factors up to 2.49 and dimensionless spin parameter chi = +0.85, +0.6, 0, -0.6, -0.85. We find that the scattering threshold becomes independent of spin at large center-of-mass energies, confirming previous conjectures that structure does not matter in ultrarelativistic collisions. It has further been argued that in this limit all of the kinetic energy of the system may be radiated by fine tuning the impact parameter to threshold. On the contrary, we find that only about 60% of the kinetic energy is radiated for gamma = 2.49. By monitoring apparent horizons before and after scattering events we show that the “missing energy” is absorbed by the individual black holes in the encounter, and moreover the individual black-hole spins change significantly. We support this conclusion with perturbative calculations. An extrapolation of our results to the limit gamma -> infinity suggests that about half of the center-of-mass energy of the system can be emitted in gravitational radiation, while the rest must be converted into rest-mass and spin energy.
Publication Date: 26-Jul-2013
Electronic Publication Date: 23-Jul-2013
Citation: Sperhake, Ulrich, Berti, Emanuele, Cardoso, Vitor, Pretorius, Frans. (2013). Universality, Maximum Radiation, and Absorption in High-Energy Collisions of Black Holes with Spin. PHYSICAL REVIEW LETTERS, 111 (10.1103/PhysRevLett.111.041101
DOI: doi:10.1103/PhysRevLett.111.041101
ISSN: 0031-9007
Type of Material: Journal Article
Journal/Proceeding Title: PHYSICAL REVIEW LETTERS
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.

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