Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2005-10-05
JHEP 0603:007,2006
Physics
High Energy Physics
High Energy Physics - Theory
34 pages + appendices, 18 figures. v2: changes and additions made to clarify presentation. refs added. v3: small changes, vers
Scientific paper
10.1088/1126-6708/2006/03/007
We study the AdS/CFT correspondence as a probe of inflation. We assume the existence of a string landscape containing at least one stable AdS vacuum and a (nearby) metastable de Sitter state. Standard arguments imply that the bulk physics in the vicinity of the AdS minimum is described by a boundary CFT. We argue that large enough bubbles of the dS phase, including those able to inflate, are described by mixed states in the CFT. Inflating degrees of freedom are traced over and do not appear explicitly in the boundary description. They nevertheless leave a distinct imprint on the mixed state. In the supergravity approximation, analytic continuation connects AdS/CFT correlators to dS/CFT correlators. This provides a framework for extracting further information as well. Our work also shows that no scattering process can create an inflating region, even by quantum tunneling, since a pure state can never evolve into a mixed state under unitary evolution.
Freivogel Ben
Hubeny Veronika E.
Maloney Alexander
Myers Robert C.
Rangamani Mukund
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