Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1995-12-05
Phys.Rev. D53 (1996) 7026-7032
Physics
High Energy Physics
High Energy Physics - Theory
16 pages, LaTeX. The hep-th number added on the cover, and minor typos corrected
Scientific paper
10.1103/PhysRevD.53.7026
We study quantum aspects of the Einstein gravity with one time-like and one space-like Killing vector commuting with each other. The theory is formulated as a $\coset$ nonlinear $\sigma$-model coupled to gravity. The quantum analysis of the nonlinear $\sigma$-model part, which includes all the dynamical degrees of freedom, can be carried out in a parallel way to ordinary nonlinear $\sigma$-models in spite of the existence of an unusual coupling. This means that we can investigate consistently the quantum properties of the Einstein gravity, though we are limited to the fluctuations depending only on two coordinates. We find the forms of the beta functions to all orders up to numerical coefficients. Finally we consider the quantum effects of the renormalization on the Kerr black hole as an example. It turns out that the asymptotically flat region remains intact and stable, while, in a certain approximation, it is shown that the inner geometry changes considerably however small the quantum effects may be.
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