Université de GenèveDépartement de Physique ThéoriqueCAP Genève

The Imaginary Starobinsky Model

24. March 2014
Cite as: 
A. Kehagias and A. Riotto [arXiv:1403.5531].

The recent detection by the BICEP2 collaboration of a high level of tensor modes seems to exclude the Starobinsky model of inflation. In this paper we show that this conclusion can be avoided: it is enough to embed the Starobinsky model in supergravity and identify the inflaton field with the imaginary (instead of the real) part of the chiral scalaron multiplet in its formulation. The Starobinsky model then becomes the chaotic quadratic model with shift symmetry during infation and is in perfect agreement with the current data.


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