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The Casimir stress on a spherical shell in de Sitter signature changingbackground for massless scalar field satisfying Dirichlet boundary conditionson the shell is calculated. The Casimir stress is calculated for inside andoutside of the shell with different backgrounds corresponding to differentmetric signatures and cosmological constants. An important contribution appearsdue to signature change which leads to a transient rapid expansion of thebubbles in this background.Comment: 8 pages, no figure

CASIMIR EFFECT FOR A SPHERICAL SHELL IN DE SITTER SPACE–TIME WITH SIGNATURE CHANGE