Strongly parabolic timelike submanifolds of Minkowsky space
Анотація
R.P. Newman proved that a timelike geodesically complete pseudo-Riemannian manifold with nonnegative Ricci curvature for all vectors and admites a timelike line is isometric to the product of that line and a spacelike complete Riemannian manifold. This result gave a complete proof of a conjecture of Yau. In this paper we proof a cylinder type-theorem which corresponds to the extrinsic version of Newman's result. Moreover, we show that k-strongly parabolic geodesically complete submanifolds of a pseudo-Euclidean space with nonnegative Ricci curvature in the spacelike directions are also cylinders with k-dimensional generators.
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A. Borisenko, M. L. Rabelo, K. Tenenblat, Strongly parabolic timelike submanifolds of Minkowsky space, Мат. физ. анал. геом. 6 (1999), 10-21.
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