Equations of Motion in General Relativity of a Small Charged Black Hole

Details Equations of Motion in General Relativity of a Small Charged Black Hole Equations of Motion in General Relativity of a Small Charged Black Hole

2008-11-25

arxiv.org/abs/0811.4020v1

Phys.Rev.D78:104014,2008

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

31 pages, Latex file

Scientific paper

10.1103/PhysRevD.78.104014

We present the details of a model in general relativity of a small charged black hole moving in an external gravitational and electromagnetic field. The importance of our model lies in the fact that we can derive the equations of motion of the black hole from the Einstein-Maxwell vacuum field equations without encountering infinities. The key assumptions which we base our results upon are that (a) the black hole is isolated and (b) near the black hole the wave fronts of the radiation generated by its motion are smoothly deformed spheres. The equations of motion which emerge fit the pattern of the original DeWitt and Brehme equations of motion (after they "renormalise"). Our calculations are carried out in a coordinate system in which the null hypersurface histories of the wave fronts can be specified in a simple way, with the result that we obtain a new explicit form, particular to our model, for the well-known "tail term" in the equations of motion.

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