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arXiv · 1307.1137

On the Starobinsky Model of Inflation from Supergravity

F. Farakos·A. Kehagias·A. Riotto
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Abstract

We discuss how the higher-derivative Starobinsky model of inflation originates from N=1 supergravity. It is known that, in the old-minimal supergravity description written by employing a chiral compensator in the superconformal framework, the Starobinsky model is equivalent to a no-scale model with F-term potential. We show that the Starobinsky model can also be originated within the so-called new-minimal supergravity, where a linear compensator superfield is employed. In this formulation, the Starobinsky model is equivalent to standard supergravity coupled to a massive vector multiplet whose lowest scalar component plays the role of the inflaton and the vacuum energy is provided by a D-term potential. We also point out that higher-order corrections to the supergravity Lagrangian represent a threat to the Starobinsky model as they can destroy the flatness of the inflaton potential in its scalar field equivalent description.

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F. Farakos, A. Kehagias, A. Riotto. 2013-10-13. On the Starobinsky Model of Inflation from Supergravity. https://doi.org/10.1016/j.nuclphysb.2013.08.005

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