= Sergei V. Ketov
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<Sergei V. Ketov> studied how curvature-driven <cosmic inflation> can arise within <supergravity>. With <Alexei A. Starobinsky>, he constructed an embedding of the $R+R^2$ inflationary model into an $N=1$ <supergravity> framework.<Embedding (R+R^2)-Inflation into Supergravity by Sergei V. Ketov and Alexei A. Starobinsky>[Abstract: embedding and the role of higher supercurvature terms]{ref}
Here $R$ denotes ordinary spacetime scalar curvature, while the supersymmetric construction uses a superfield extension. Relating the two descriptions is a model-building calculation; adding a curvature term to an action does not alone establish all of its supersymmetric couplings or the required slow-roll regime.
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