Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
1994-07-19
Class.Quant.Grav.12:809-826,1995
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
16 pages, LaTex. 4 figures are available upon request (hard copy)
Scientific paper
10.1088/0264-9381/12/3/017
The multidimensional cosmological model describing the evolution of $n$ Einstein spaces in the presence of multicomponent perfect fluid is considered. When certain restrictions on the parameters of the model are imposed, the dynamics of the model near the singularity is reduced to a billiard on the $(n-1)$-dimensional Lobachevsky space $H^{n-1}$. The geometrical criterion for the finiteness of the billiard volume and its compactness is suggested. This criterion reduces the problem to the problem of illumination of $(n-2)$-dimensional sphere $S^{n-2}$ by point-like sources. Some generalization of the considered scheme (including scalar field and quantum generalizations) are considered.
Ivashchuk Vladimir D.
Melnikov Vitaly N.
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