Thursday, March 14, 2013

1303.3224 (Francisco G. Pedro et al.)

The Scale of Inflation in the Landscape    [PDF]

Francisco G. Pedro, Alexander Westphal
We determine the frequency of regions of small-field inflation in the Wigner landscape as an approximation to random supergravities/type IIB flux compactifications. We show that small-field inflation occurs exponentially more often than large-field inflation The power of primordial gravitational waves from inflation is generically tied to the scale of inflation. For small-field models this is below observational reach. However, we find small-field inflation to be dominated by the highest inflationary energy scales compatible with a sub-Planckian field range. Hence, we expect a typical tensor-to-scalar ratio $r\sim {\cal O}(10^{-3})$ currently undetectable in upcoming CMB measurements.
View original: http://arxiv.org/abs/1303.3224

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