Loop inflection-point inflation

Dimopoulos, Konstantinos and Owen, Charlotte and Racioppi, Antonio (2018) Loop inflection-point inflation. Astroparticle Physics, 103. pp. 16-20. ISSN 0927-6505

[thumbnail of 1706.09735]
PDF (1706.09735)
1706.09735.pdf - Accepted Version
Available under License Creative Commons Attribution-NonCommercial-NoDerivs.

Download (576kB)


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.

Item Type:
Journal Article
Journal or Publication Title:
Astroparticle Physics
Additional Information:
This is the author’s version of a work that was accepted for publication in Astroparticle Physics. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Astroparticle Physics, 103, 2018 DOI: 10.1016/j.astropartphys.2018.06.002
Uncontrolled Keywords:
?? cosmic inflationparticle phenomenologyphysics and astronomy(all)astronomy and astrophysicsdiscipline-based research ??
ID Code:
Deposited By:
Deposited On:
12 Jul 2018 14:18
Last Modified:
25 Nov 2023 00:23