Coleman-Weinberg inflation in light of Planckopen access
- Authors
- Barenboim, Gabriela; Chun, Eung Jin; Lee, Hyun Min
- Issue Date
- Mar-2014
- Publisher
- ELSEVIER SCIENCE BV
- Citation
- PHYSICS LETTERS B, v.730, pp 81 - 88
- Pages
- 8
- Journal Title
- PHYSICS LETTERS B
- Volume
- 730
- Start Page
- 81
- End Page
- 88
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/12404
- DOI
- 10.1016/j.physletb.2014.01.039
- ISSN
- 0370-2693
1873-2445
- Abstract
- We revisit a single field inflationary model based on Coleman-Weinberg potentials. We show that in small field Coleman-Weinberg inflation, the observed amplitude of perturbations needs an extremely small quartic coupling of the inflaton, which might be a signature of radiative origin. However, the spectral index obtained in a standard cosmological scenario turns out to be outside the 2 sigma region of the Planck data. When a non-standard cosmological framework is invoked, such as brane-world cosmology in the Randall-Sundrum model, the spectral index can be made consistent with Planck data within la, courtesy of the modification in the evolution of the Hubble parameter in such a scheme. We also show that the required inflaton quartic coupling as well as a phenomenologically viable B - L symmetry breaking together with a natural electroweak symmetry breaking can arise dynamically in a generalized B - L extension of the Standard Model where the full potential is assumed to vanish at a high scale. (C) 2014 The Authors. Published by Elsevier B.V.
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