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Measurements of the cosmic microwave background (CMB) favour models ofinflation with a small tensor-to-scalar ratio r, as predicted by theStarobinsky R + R^2 model. It has been shown previously that various modelsbased on no-scale supergravity with different forms of superpotential makepredictions similar to those of the Starobinsky model. In this paper we presenta unified and general treatment of Starobinsky avatars of no-scalesupergravity, using the underlying non-compact SU(2,1)/SU(2) x U(1) symmetry todemonstrate equivalences between different models, exhibiting 6 specificequivalence classes.

A General Classification of Starobinsky-like Inflationary Avatars of SU(2,1)/SU(2) x U(1) No-Scale Supergravity