Regular Article - Theoretical Physics
Scalar perturbation produced at the pre-inflationary stage in Eddington-inspired Born–Infeld gravity
Institute of Convergence Fundamental Studies, School of Liberal Arts, Seoul National University of Science and Technology, Seoul, 139-743, Korea
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Accepted: 13 May 2015
Published online: 3 June 2015
We investigate the scalar perturbation produced at the pre-inflationary stage driven by a massive scalar field in Eddington-inspired Born–Infeld gravity. The scalar power spectrum exhibits a peculiar rise for low k-modes. The tensor-to-scalar ratio can be significantly lowered compared with that in the standard chaotic inflation model in general relativity. This result is very affirmative considering the recent dispute on the detection of gravitational wave radiation between PLANCK and BICEP2.
© The Author(s), 2015