Scalar potential in F(R) supergravity

We derive a scalar potential in the recently proposed N=1 supersymmetric generalization of f® gravity in four space-time dimensions. Any such higher-derivative supergravity is classically equivalent to the standard N=1 supergravity coupled to a chiral (matter) superfield, via a Legendre-Weyl transform in superspace. The Kaehler potential, the superpotential and the scalar potential of that theory are all governed by a single holomorphic function. We also find the conditions for the vanishing cosmological constant and spontaneous supersymmetry breaking, without fine-tuning, which define a no-scale F® supergravity. The F® supergravities are suitable for physical applications in the inflationary cosmology based on supergravity and superstrings.