The Imaginary Starobinsky Model
High Energy Physics - Theory
2015-06-19 v3 Cosmology and Nongalactic Astrophysics
General Relativity and Quantum Cosmology
High Energy Physics - Phenomenology
Abstract
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: one can 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. Once coupled to matter, the Starobinsky model may then become the chaotic quadratic model with shift symmetry during inflation and is in good agreement with the current data.
Keywords
Cite
@article{arxiv.1403.5531,
title = {The Imaginary Starobinsky Model},
author = {Sergio Ferrara and Alex Kehagias and Antonio Riotto},
journal= {arXiv preprint arXiv:1403.5531},
year = {2015}
}
Comments
14 pages, 1 figure