Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
1997-03-26
A. Garcia et al. (eds.): Recent Developments in Gravitation and Mathematical Physics, Science Network Publishing, Konstanz 199
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
14 pages, LaTex, includes 1 figure, To appear in A.Garcia et al. (eds.): Recent Developments in Gravitation and Mathematical P
Scientific paper
The exact global solution of the Einstein equations [Neugebauer & Meinel, Phys. Rev. Lett. 75 (1995) 3046] describing a rigidly rotating, self-gravitating disk is discussed. The underlying matter model is a perfect fluid in the limit of vanishing pressure. The solution represents the general-relativistic analogue of the classical Maclaurin disk. It was derived by applying solution techniques from soliton theory to the axisymmetric, stationary vacuum Einstein equations. In contrast to the Newtonian solution, there exists an upper limit for the total mass of the disk - if the angular momentum is fixed. At this limit, a transition to a rotating black hole, i.e., to the Kerr solution occurs. Another limiting procedure leads to an interesting cosmological solution. These results prove conjectures formulated by Bardeen and Wagoner more than twenty-five years ago.
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