Does string theory predict an open universe?

Details Does string theory predict an open universe? Does string theory predict an open universe?

2006-10-20

arxiv.org/abs/hep-th/0610231v2

Phys.Lett.B660:382-385,2008

Physics

High Energy Physics

High Energy Physics - Theory

4 pages, 1 figure, revtex. Final version to appear in Physics Letters B

Scientific paper

10.1016/j.physletb.2008.01.007

It has been claimed that the string landscape predicts an open universe, with negative curvature. The prediction is a consequence of a large number of metastable string vacua, and the properties of the Coleman--De Luccia instanton which describes vacuum tunneling. We examine the robustness of this claim, which is of particular importance since it seems to be one of string theory's few claims to falsifiability. We find that, due to subleading tunneling processes, the prediction is sensitive to unknown properties of the landscape. Under plausible assumptions, universes like ours are as likely to be closed as open.

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