Casimir Effect for Concentric Spheres in de Sitter Spacetime with Signature Change |
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Authors: | F Darabi |
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Institution: | (1) Department of Physics, Azarbaijan University of Tarbiat Moallem, Tabriz, 53714-161, Iran;(2) Research Institute for Astronomy and Astrophysics of Maragha (RIAAM), Maragha, 55134-441, Iran |
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Abstract: | We revisit the Casimir effect for two concentric spherical shells in de Sitter background with a new geometric configuration,
namely Euclidean signature between and Lorentzian signature outside the spheres with different cosmological constants, for
a massless scalar field satisfying Dirichlet boundary conditions on the spheres. It is shown that an extra constant pressure
emerges due to this signature changing configuration. Some interesting aspects of this extra term are then discussed. |
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Keywords: | Casimir effect Signature change de Sitter spacetime |
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