Simple single-field inflation models with arbitrarily small tensor/scalar ratio
Nina K. Stein, William H. Kinney
Abstract
Abstract We construct a family of simple single-field inflation models consistent with Planck / BICEP Keck bounds which have a parametrically small tensor amplitude and no running of the scalar spectral index. The construction consists of a constant-roll hilltop inflaton potential with the end of inflation left as a free parameter induced by higher-order operators which become dominant late in inflation. This construction directly demonstrates that there is no lower bound on the tensor/scalar ratio for simple single-field inflation models.
Topics & Concepts
InflatonPhysicsInflation (cosmology)Spectral indexScalar (mathematics)Scalar fieldPlanckTensor (intrinsic definition)Slow rollTheoretical physicsMathematical physicsQuantum mechanicsGeometryMathematicsSpectral lineCosmology and Gravitation TheoriesBlack Holes and Theoretical PhysicsStochastic processes and financial applications