Phys. Rev. D 68, 083512 (2003) [4 pages]Kantowski-Sachs universe cannot be closedReceived 29 April 2003; published 30 October 2003 In this paper, by analyzing the instability against spatially homogeneous and anisotropic perturbations of the Kantowski-Sachs type during different cosmological epochs, we show that it is a theoretical consequence of general relativity that the KS universe must be open or flat if it underwent a matter-dominated and/or radiation-dominated era in its past evolution, which theoretically confirms the flatness of our observable Universe. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.68.083512
DOI:
10.1103/PhysRevD.68.083512
PACS:
98.80.-k, 95.30.Sf
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