4.2 Article

Loop inflection-point inflation

Journal

ASTROPARTICLE PHYSICS
Volume 103, Issue -, Pages 16-20

Publisher

ELSEVIER SCIENCE BV
DOI: 10.1016/j.astropartphys.2018.06.002

Keywords

Cosmology; Inflation; Inflection point; Loop corrections

Funding

  1. Lancaster-Manchester-Sheffield Consortium for Fundamental Physics under STFC [ST/L000520/1]
  2. FST of Lancaster University
  3. Estonian Research Council [IUT23-6, PUT1026]
  4. ERDF Centre of Excellence [TK133]
  5. STFC [ST/J000418/1, ST/P000800/1, ST/L000520/1] Funding Source: UKRI

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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 similar or equal to 4 x 10(-4). The necessary fine-tuning is only similar to 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-sigma bound of the latest CMB observations, with a very small negative running, and negligible tensors (r similar to 10-((9-10))). These results are largely independent of the order of the stabilising non-renormalisable operator. (C) 2018 Elsevier B.V. All rights reserved.

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