A Gravity Dual of Ultra-slow Roll Inflation

TL;DR

This paper constructs a gravity dual model of ultra-slow roll inflation within type IIB supergravity, providing analytical solutions that could shed light on anomalies in the cosmic microwave background power spectrum.

Contribution

It introduces a novel class of analytical solutions in supergravity that serve as gravitational duals for ultra-slow roll inflation models.

Findings

Derived explicit solutions representing ultra-slow roll inflation

Potential implications for understanding CMB low l anomalies

Advances the gauge/gravity duality approach to cosmological inflation

Abstract

We study time-dependent deformations of a certain class of backgrounds in type IIB supergravity. These backgrounds are solutions of a five-dimensional consistent truncation, relevant for gauge/gravity duality, which have the form of dS_4 foliations over a fifth (radial) direction. We investigate time-dependent deformations of those solutions in the search for gravitational duals of models of glueball inflation. A particular starting ansatz enables us to find a class of analytical solutions, corresponding to an ultra-slow roll inflationary regime. This regime may play a role in understanding the low l anomaly in the power spectrum of the CMB.