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Anti-de Sitter island-universes from 5D standing waves. (English) Zbl 1193.83047

Summary: We construct simple standing wave solutions in a 5D spacetime with a ghost-like scalar field. The nodes of these standing waves are “islands” of 4D anti-de Sitter spacetime. In the case of increasing (decreasing) warp factor, there are a finite (infinite) number of nodes and thus a finite (infinite) number of anti-de Sitter island-universes having different gravitational and cosmological constants. This is similar to the landscape models, which postulate a large number of universes with different parameters.

MSC:

83E30 String and superstring theories in gravitational theory
83E15 Kaluza-Klein and other higher-dimensional theories
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