Reconstruction of α-attractor supergravity models of inflation

In this paper, we apply reconstruction techniques to recover the potential parameters for a particular class of single-field models, the α-attractor (supergravity) models of inflation. This also allows us to derive the inflaton vacuum expectation value at horizon crossing. We show how to use this value as one of the input variables to constrain the postaccelerated inflationary phase. We assume that the tensor-to-scalar ratio r is of the order of 10-3, a level reachable by the expected sensitivity of the next-generation cosmic macrowave background (radiation) experiments.