Is Imaginary Starobinsky Model Real?

Abstract

We investigate the recently proposed possibility of chaotic inflation with respect to the imaginary part of the field T in a supersymmetric embedding of the Starobinsky model. We show that the stage of rapid expansion driven by Im T in this model ends almost instantly, and the subsequent stages of inflation are driven by the real part of the field T, as in the standard Starobinsky model. Thus, the Starobinsky model and its supersymmetric generalizations remain disfavored by the recent BICEP2 data.

10 pages, 6 figures, minor corrections

References in corpus (4)

• New models of chaotic inflation in supergravity
• General inflaton potentials in supergravity
• The Imaginary Starobinsky Model
• Cosmological Attractor Models and Higher Curvature Supergravity

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