Publikace ÚTF

The static, apparently cylindrically symmetric vacuum solution of Linet and Tian for the case of a positive cosmological constant Lambda is shown to have toroidal symmetry and, besides Lambda, to include three arbitrary parameters. It possesses two curvature singularities, of which one can be removed by matching it across a toroidal surface to a corresponding region of the dust-filled Einstein static universe. In four dimensions, this clarifies the geometrical properties, the coordinate ranges, and the meaning of the parameters in this solution. Some other properties and limiting cases of this space-time are described. Its generalization to any higher number of dimensions is also explicitly given.