Kahler potentials for the MSSM inflation and the spectral index

Details Kahler potentials for the MSSM inflation and the spectral index Kahler potentials for the MSSM inflation and the spectral index

2007-10-08

arxiv.org/abs/0710.1613v2

JCAP 0801:016,2008

Physics

High Energy Physics

High Energy Physics - Theory

13 pages, one figure. Typos corrected and a reference added

Scientific paper

10.1088/1475-7516/2008/01/016

Recently it has been argued that some of the fine-tuning problems of the MSSM inflation associated with the existence of a saddle point along a flat direction may be solved naturally in a class of supergravity models. Here we extend the analysis and show that the constraints on the Kahler potentials in these models are considerably relaxed when the location of the saddle point is treated as a free variable. We also examine the effect of supergravity corrections on inflationary predictions and find that they can slightly alter the value of the spectral index. As an example, for flat direction field values $|\bar{\phi}_0|=1\times10^{-4}M_P$ we find $n\sim0.92 ... 0.94$ while the prediction of the MSSM inflation without any corrections is $n\sim0.92$.

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