Light rays joining two submanifolds in space-times (Q1360577)
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scientific article; zbMATH DE number 1036749
| Language | Label | Description | Also known as |
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| English | Light rays joining two submanifolds in space-times |
scientific article; zbMATH DE number 1036749 |
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Light rays joining two submanifolds in space-times (English)
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12 February 1998
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In the paper [\textit{D. Fortunato}, \textit{F. Giannoni} and \textit{A. Masiello}, J. Geom. Phys. 15, No. 2, 159-188 (1995; Zbl 0819.53037)], lightlike geodesics joining an event to a vertical line have been studied. In this paper, the number of light rays joining two submanifolds in a stationary Lorentz manifold is estimated by the category of the product of the two manifolds under certain additional conditions.
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variational methods
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Lyusternik-Schnirelman category
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general relativity
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light rays
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0.8685945
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0.86266464
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0.8567405
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0.8557925
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0.8463653
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0.84624463
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