http://arxiv.org/abs/1411.4636
In this paper we will derive bounds on tensor-to-scalar ratio, $r$, string coupling, $g_s$ and compactification volume, ${\cal V}_E$, by demanding the validity of an effective field theory – the inflationary scale and the Hubble parameter during inflation must be well below the Kaluza-Klein (KK) mass scale, string scale, and $4$ dimensional Planck mass. Within type IIB orientifold compactifications, we can put further constraints on the parameters by invoking the hierarchy between gravitino mass in $4$ dimensions and inflationary scale.
A. Mazumdar and P. Shukla
Tue, 18 Nov 14
11/79
Comments: 4 pages
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