Ultra-massive spacetimes in 2+1 dimensions with positive Λ

Abstract

We show that ultra-massive spacetimes exist also in 2 + 1 dimensions with a positive cosmological constant Λ > 0. They can be created through the collapse of a spherical null dust shell. The exterior of the shell is then a Mess spacetime, that is to say a locally de Sitter spacetime that cannot be obtained as a quotient of de Sitter space.

arXiv comment16 pages, 5 figures. Minor corrections and improved discussion. Matches published version

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