Slow-walking inflation

Abstract

We propose a new model of slow-roll inflation in string cosmology, based on warped throat supergravity solutions displaying 'walking' dynamics, i. e. the coupling constant of the dual gauge theory slowly varies over a range of energy scales. The features of the throat geometry are sourced by a rich field content, given by the dilaton and RR and NS fluxes. By considering the motion of a D3-brane probe in this geometry, we are able to analytically calculate the brane potential in a physically interesting regime. This potential has an inflection point: in its proximity we realize a model of inflation lasting sixty e-foldings, and whose robust predictions are in agreement with current observations. We are also able to interpret some of the most interesting aspects of this scenario in terms of the properties of the QFT dual theory.

A gravity dual of ultra-slow roll inflation

“…Let us just mention, as a relatively recent example, the paper [24] and references therein. 8 Recall that even the scalar power spectrum can be derived just from metric fluctuations upon using comoving gauge; the relevant scalar degree of freedom, then, is the curvature perturbation.…”