Dynamical Inflection Point Inflation

Abstract

We provide a mechanism to obtain multiple inflection points for the inflaton potential based on the Coleman-Weinberg potential. The key ingredient is the existence of zeros of the inflaton quartic coupling beta function, which can be simply realized by a sign change of a gauge coupling beta function at a massive threshold scale in gauge-Yukawa models. A universal inflaton potential emerges for a wide range of models and can accommodate the experimental data in the small-field inflation scenario. While the ratio of tensor over scalar amplitudes is predicted to be small, the running of the scalar spectral index, ${\alpha }_s$, has branches with both positive and negative values. The positive branch with ${\alpha }_s\gtrsim 0.002$ will be tested by the coming cosmic microwave background experiments.

22 pages, 7 figures. v2: New section discussing attractor solutions, new plot with ns vs r, version accepted in JCAP

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• The Atacama Cosmology Telescope: DR4 Maps and Cosmological Parameters
• CMB-S4 Science Case, Reference Design, and Project Plan
• Gauge invariant MSSM inflaton
• A Delicate Universe
• Ultra slow-roll inflation demystified
• Attraction towards an inflection point inflation
• Coleman-Weinberg Potential In Good Agreement With WMAP
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Cited by in corpus (3)

• Large Field Polynomial Inflation: Parameter Space, Predictions and (Double) Eternal Nature
• Radiative Plateau Inflation with Conformal Invariance: Dynamical Generation of Electroweak and Seesaw Scales
• Large Field Polynomial Inflation in Palatini $f(R,\varphi )$ Gravity