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arXiv · 1404.3756

Primordial gravitational wave of BICEP2 from dynamical double hybrid inflation

Ki-Young Choi·Bumseok Kyae
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Abstract

BICEP2 has observed a primordial gravitational wave corresponding to the tensor-to-scalar ratio of 0.16. It seems to require a super-Planckian inflationary model. In this paper, we propose a double hybrid inflation model, where the inflaton potential dynamically changes with the evolution of the inflaton fields. During the first phase of inflation over 7 e-folds, the power spectrum can be almost constant by a large linear term in the hybrid potential, which is responsible also for the large tensor-to-scalar ratio. In the second phase of 50 e-folds, the dominant potential becomes dynamically changed to the logarithmic form as in the ordinary supersymmetric hybrid inflation, which is performed by the second inflaton field. In this model, the sub-Planckian field values (~0.9 M_P) can still yield the correct cosmic observations with the sufficient e-folds.

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Ki-Young Choi, Bumseok Kyae. 2014-06-30. Primordial gravitational wave of BICEP2 from dynamical double hybrid inflation. https://doi.org/10.1016/j.physletb.2014.06.053

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