• DOI:10.1007/JHEP06(2018)006
• Corpus ID: 118936662

Symmetry breaking patterns for inflation

@article{Klein2018SymmetryBP,
  title={Symmetry breaking patterns for inflation},
  author={R Klein and D. van der Roest and David Stefanyszyn},
  journal={Journal of High Energy Physics},
  year={2018},
  volume={2018},
  pages={1-23}
}

• R. Klein, D. Roest, David Stefanyszyn
• Published 15 December 2017
• Mathematics
• Journal of High Energy Physics

A bstractWe study inflationary models where the kinetic sector of the theory has a non-linearly realised symmetry which is broken by the inflationary potential. We distinguish between kinetic symmetries which non-linearly realise an internal or space-time group, and which yield a flat or curved scalar manifold. This classification leads to well-known inflationary models such as monomial inflation and α-attractors, as well as a new model based on fixed couplings between a dilaton and many axions which non-linearly realises higher-dimensional conformal symmetries. In this model, inflation can be realised along the dilatonic direction, leading to a tensor-to-scalar ratio r ∼ 0.01 and a spectral index ns ∼ 0.975. We refer to the new model as ambient inflation since inflation proceeds along an isometry of an anti-de Sitter ambient space-time, which fully determines the kinetic sector.