Beyond the Starobinsky model for inflationopen access
- Authors
- Cheong, Dhong Yeon; Lee, Hyun Min; Park, Seong Chan
- Issue Date
- Jun-2020
- Publisher
- Elsevier B.V.
- Citation
- Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, v.805
- Journal Title
- Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
- Volume
- 805
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/41928
- DOI
- 10.1016/j.physletb.2020.135453
- ISSN
- 0370-2693
1873-2445
- Abstract
- We single out the Starobinsky model and its extensions among generic f(R) gravity as attractors at large field values for chaotic inflation. Treating a R3 curvature term as a perturbation of the Starobinsky model, we impose the phenomenological bounds on the additional term satisfying the successful inflationary predictions. We find that the scalar spectral index can vary in both the red or blue tilted direction, depending on the sign of the coefficient of the R3 term, whereas the tensor-to-scalar ratio is less affected in the Planck-compatible region. We also discuss the role of higher order curvature term for stability and the reheating dynamics for the unambiguous prediction for the number of efoldings up to the R3 term. © 2020 The Author(s)
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Collections - College of Natural Sciences > Department of Physics > 1. Journal Articles
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