Spatial Kasner solution and an infinite slab with constant energy density
A. Yu. Kamenshchik+*, T. Vardanyan×°
+Dipartimento di Fisica e Astronomia, Universitàdi Bologna and Istituto Nazionale di Fisica Nucleare,
via Irnerio 46, 40126 Bologna, Italy
*L. D. Landau Institute for Theoretical Physics Russian Academy of Sciences, 117940 Moscow, Russia
×Dipartimento di Fisica e Chimica, Universitàdi L'Aquila, 67100 Coppito, L'Aquila, Italy
°Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali del Gran Sasso, 67010 Assergi, L'Aquila, Italy
Abstract
We study the solutions of the Einstein equations in the
presence of a thick infinite slab with constant energy density. When
there is an isotropy in the plane of the slab, we find an explicit exact
solution that matches with the Rindler and Weyl-Levi-Civita spacetimes
outside the slab. We also show that there are solutions that can be
matched with general anisotropic Kasner spacetime outside the slab. In
any case, it is impossible to avoid the presence of the Kasner type
singularities in contrast to the well-known case of spherical symmetry,
where by matching the internal Schwarzschild solution with the external
one, the singularity in the center of coordinates can be eliminated.