Coleman-Weinberg Inflation in light of Planck

Gabriela Barenboim; Eung Jin Chun; Hyun Min Lee

doi:10.1016/j.physletb.2014.01.039

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arXiv · 1309.1695

Coleman-Weinberg Inflation in light of Planck

Gabriela Barenboim·Eung Jin Chun·Hyun Min Lee

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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 1 sigma, 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.

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Gabriela Barenboim, Eung Jin Chun, Hyun Min Lee. 2014-01-23. Coleman-Weinberg Inflation in light of Planck. https://doi.org/10.1016/j.physletb.2014.01.039

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