Dimopoulos, Konstantinos and Owen, Charlotte and Racioppi, Antonio (2018) Loop inflection-point inflation. Astroparticle Physics, 103. pp. 16-20. ISSN 0927-6505
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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≃4×10^{−4}. The necessary fine-tuning is only ∼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 a very small negative running, and negligible tensors (r∼10^{−(9−10)}). These results are largely independent of the order of the stabilising non-renormalisable operator.