%0 Journal Article
%T The Minimal Volkov - Akulov - Starobinsky Supergravity
%A I. Antoniadis
%A E. Dudas
%A S. Ferrara
%A A. Sagnotti
%J Physics
%D 2014
%I arXiv
%R 10.1016/j.physletb.2014.04.015
%X We construct a supergravity model whose scalar degrees of freedom arise from a chiral superfield and are solely a scalaron and an axion that is very heavy during the inflationary phase. The model includes a second chiral superfield $X$, which is subject however to the constraint $X^2=0$ so that it describes only a Volkov - Akulov goldstino and an auxiliary field. We also construct the dual higher - derivative model, which rests on a chiral scalar curvature superfield ${\cal R}$ subject to the constraint ${\cal R}^2=0$, where the goldstino dual arises from the gauge - invariant gravitino field strength as $\gamma^{mn} {\cal D}_m \psi_n$. The final bosonic action is an $R+R^2$ theory involving an axial vector $A_m$ that only propagates a physical pseudoscalar mode.
%U http://arxiv.org/abs/1403.3269v2