Complexified Starobinsky inflation in supergravity in the light of recent BICEP2 result

Motivated by the recent observation of the B-mode signal in the cosmic microwave background by BICEP2, we study the Starobinsky-type inflation model in the framework of old-minimal supergravity, where the inflaton field in the original (non-supersymmetric) Starobinsky inflation model is promoted to...

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Bibliographic Details
Published in:Physics letters. B 2014-06, Vol.733, p.305-308
Main Authors: Hamaguchi, Koichi, Moroi, Takeo, Terada, Takahiro
Format: Article
Language:English
Subjects:
Cosmic microwave background
Elementary particles
Inflation
Initial conditions
Mathematical models
Scalars
Supergravity
Two dimensional
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Summary:Motivated by the recent observation of the B-mode signal in the cosmic microwave background by BICEP2, we study the Starobinsky-type inflation model in the framework of old-minimal supergravity, where the inflaton field in the original (non-supersymmetric) Starobinsky inflation model is promoted to a complex field. We study how the inflaton evolves on the two-dimensional field space, varying the initial conditions. We show that (i) one of the scalar fields has a very steep potential once the trajectory is off from that of the original Starobinsky inflation, and that (ii) the B-mode signal observed by BICEP2 is too large to be consistent with the prediction of the model irrespective of the initial conditions. Thus, the BICEP2 result strongly disfavors the complexified Starobinsky inflation in supergravity.
ISSN:0370-2693
1873-2445
DOI:10.1016/j.physletb.2014.05.006