Black hole interacting with matter as a simple dynamical system

Details Black hole interacting with matter as a simple dynamical system Black hole interacting with matter as a simple dynamical system

1998-07-16

arxiv.org/abs/gr-qc/9807042v1

J.Math.Phys. 40 (1999) 318-339

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

Latex, no figures, 26 pages

Scientific paper

Recently, a variational principle has been derived from Einstein-Hilbert and a matter Lagrangian for the spherically symmetric system of a dust shell and a black hole. The so-called physical region of the phase space, which contains all physically meaningful states of the system defined by the variational principle, is specified; it has a complicated boundary. The principle is then transformed to new variables that remove some problems of the original formalism: the whole phase space is covered (in particular, the variables are regular at all horizons), the constraint has a polynomial form, and the constraint equation is uniquely solvable for two of the three conserved momenta. The solutions for the momenta are written down explicitly. The symmetry group of the system is studied. The equations of motion are derived from the transformed principle and are shown to be equivalent to the previous ones. Some lower-dimensional systems are constructed by exclusion of cyclic variables, and some of their properties are found.

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