The Planck value of the spectral index can be interpreted as ns=1−2/N
in terms of the number of e-foldings N. An appealing explanation for this
phenomenological observation is provided by α-attractors: the
inflationary predictions of these supergravity models are fully determined by
the curvature of the Kahler manifold. We provide a novel formulation of
α-attractors which only involves a single chiral superfield. Our
construction involves a natural deformation of no-scale models, and employs
these to construct a De Sitter plateau with an exponential fall-off. Finally,
we show how analogous structures with a flat Kahler geometry arise as a
singular limit of such α-scale models.Comment: 6 pages, 3 figures. v3: minor clarifications and refs added. PRD
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