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ID: 265019.0, MPI für Gravitationsphysik / Geometric Analysis and Gravitation
Introduction to dynamical horizons in numerical relativity
Authors:Schnetter, Erik; Krishnan, Badri; Beyer, Florian
Date of Publication (YYYY-MM-DD):2006
Title of Journal:Physical Review D
Volume:74
Issue / Number:2
Sequence Number of Article:024028
Review Status:not specified
Audience:Not Specified
Abstract / Description:This paper presents a quasi-local method of studying the physics of dynamical black holes in numerical simulations. This is done within the dynamical horizon framework, which extends the earlier work on isolated horizons to time-dependent situations. In particular: (i) We locate various kinds of marginal surfaces and study their time evolution. An important ingredient is the calculation of the signature of the horizon, which can be either spacelike, timelike, or null. (ii) We generalize the calculation of the black hole mass and angular momentum, which were previously defined for axisymmetric isolated horizons to dynamical situations. (iii) We calculate the source multipole moments of the black hole which can be used to verify that the black hole settles down to a Kerr solution. (iv) We also study the fluxes of energy crossing the horizon, which describes how a black hole grows as it accretes matter and/or radiation.
We describe our numerical implementation of these concepts and apply them to three specific test cases, namely, the axisymmetric head-on collision of two black holes, the axisymmetric collapse of a neutron star, and a non-axisymmetric black hole collision with non-zero initial orbital angular momentum.
External Publication Status:published
Document Type:Article
Communicated by:Gerhard Huisken
Affiliations:MPI für Gravitationsphysik/Astrophysical Relativity
MPI für Gravitationsphysik/Geometric Analysis and Gravitation
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