Double-bubble spacetimes

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Abstract
Previous analyses are extended to the study of spacetimes consisting of two identical, nonflat spherical bubbles glued together by a thin wall exhibiting a constant ratio Γ of tension to surface energy density. Particularly simple solutions correspond to bubbles of Schwarzschild vacua and to bubbles of Friedmann cosmologies separated by a cosmic-string network. The wall is gravitationally attractive if Γ and repulsive if Γ>1/2.

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