SIGNATURES OF STRING LANDSCAPE FROM INFLATION

Sasaki M.

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Open ination is a cosmological scenario in which the universe is a vacuum bubble nucleated from false vacuum decay and a period of inationary expansion followed in the nucleated bubble. This scenario is currently receiving renewed interest in the context of the string theory landscape. Since there are a large number of metastable de Sitter vacua in the string landscape, tunneling from one vacuum to another occurs frequently through the bubble nucleation and open ination is naturally realized. We argue that though the universe appears to be very at, a small deviation of омега0 from unity can make the effect of tensor-type perturbations on the large angle CMB anisotropy signicant. Thus we are already testing the string landscape against observations.

Keywords: string landscape, false vacuum decay, open ination

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Issue: 13, 2012

Pages: 145 — 148

Downloads: 859