Table of Contents
ISRN High Energy Physics
Volume 2012, Article ID 714823, 5 pages
Research Article

Krein Space Quantization of Casimir Effect for a Spherical Shell

1Department of Physics, Payame Noor University, P.O. Box 19395-3697, Tehran, Iran
2Amirkabir University of Technology, Tehran 15914, Iran

Received 22 August 2011; Accepted 18 September 2011

Academic Editors: S. Paganis and I. V. Vancea

Copyright © 2012 F. Payandeh. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The Casimir stress on a spherical shell in de Sitter spacetime for a massless scalar field is calculated using Krein space quantization. In this method, the auxiliary negative frequency states have been utilized, the modes of which do not interact with the physical states and are not affected by the physical boundary conditions. These unphysical states just play the role of an automatic renormalization tool for the theory.