Accelerating Universes from Compactification on a Warped Conifold

TL;DR

This paper presents a cosmological solution from 10d supergravity compactified on a warped conifold, enabling accelerated expansion in 4d without violating no-go theorems, and offering new insights into supergravity and string cosmology.

Contribution

It introduces a novel compactification model on a warped conifold that achieves accelerated expansion, bypassing previous no-go theorems, with fixed volume moduli and smooth solutions.

Findings

Achieves accelerated expansion in 4d cosmology from supergravity compactification.

Provides a smooth, extremized warp factor solution supporting flat FRW cosmology.

Circumvents traditional no-go theorems for warped flux compactifications.

Abstract

We find a cosmological solution corresponding to compactification of 10d supergravity on a warped conifold that easily circumvents `no-go' theorem given for a warped/flux compactification, providing new perspectives for the study of supergravity or superstring theory in cosmological backgrounds. With fixed volume moduli of the internal space, the model can explain a physical universe undergoing an accelerated expansion in the 4d Einstein frame, for a sufficiently long time. The solution found in the limit that the warp factor dependent on the radial coordinate $y$ is extremized (giving a constant warping) is smooth and it supports a flat four-dimensional Friedmann-Robertson-Walker cosmology undergoing a period of accelerated expansion with slowly rolling or stabilized volume moduli.