TY - JOUR

T1 - Symmetry breaking patterns for inflation

AU - Klein, Remko

AU - Roest, Diederik

AU - Stefanyszyn, David

PY - 2018/6/1

Y1 - 2018/6/1

N2 - We 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 alpha-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 similar to 0.01 and a spectral index n(s) similar to 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.

AB - We 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 alpha-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 similar to 0.01 and a spectral index n(s) similar to 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.

KW - Effective Field Theories

KW - Global Symmetries

KW - Space-Time Symmetries

KW - PHENOMENOLOGICAL LAGRANGIANS

KW - CHAOTIC INFLATION

KW - ATTRACTORS

U2 - 10.1007/JHEP06(2018)006

DO - 10.1007/JHEP06(2018)006

M3 - Article

JO - Journal of High Energy Physics

JF - Journal of High Energy Physics

SN - 1126-6708

IS - 6

M1 - 006

ER -