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arXiv · 1706.09735

Loop inflection-point inflation

Konstantinos Dimopoulos·Charlotte Owen·Antonio Racioppi
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Abstract

A novel inflection-point inflation model is analysed. The model considers a massless scalar field, whose self-coupling's running is stabilised by a non-renormalisable operator. The running is controlled by a fermion loop. We find that successful inflation is possible for a natural value of the Yukawa coupling $y\simeq 4\times 10^{-4}$. The necessary fine-tuning is only $\sim 10^{-6}$, which improves on the typical tuning of inflection-point inflation models, such as MSSM inflation. The model predicts a spectral index within the 1-$σ$ bound of the latest CMB observations, with negligible tensors ($r\sim 10^{-(9-10)}$). These results are largely independent of the order of the stabilising non-renormalisable operator.

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Konstantinos Dimopoulos, Charlotte Owen, Antonio Racioppi. 2018-07-04. Loop inflection-point inflation. https://doi.org/10.1016/j.astropartphys.2018.06.002

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