Bubble dynamics in the expanding universe |
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Authors: | K Maeda |
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Institution: | (1) International School for Advanced Studies, Trieste, Italy |
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Abstract: | Using the Gauss-Codazzi equations, the behavior of a singular hypersurface, which divides the universe into two Friedmann-Robertson-Walker space-time regionsV
+ andV
–, is investigated. The equation of motion for a spherical bubble in the expanding universe is presented and the physical meaning of the equation is clarified. The equations of state for fluids inV
± and on the boundary shell, which should be determined by microscopic physics, are arbitrary in the present geometrical approach. The derived equations are quite similar to those for a shell in a vacuum and can be applied to the case that one ofV
± or both are Schwarzschild-de Sitter space-time too. |
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Keywords: | |
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