Dark energy, Ricci-nonflat spaces, and the Swampland

TL;DR

This paper examines how dark energy constraints from the Swampland conjectures impact string theory models, focusing on the Salam-Sezgin model and its cosmological implications.

Contribution

It critically analyzes the compatibility of Swampland constraints with the Salam-Sezgin model and discusses implications for string model building.

Findings

Swampland constraints challenge certain dark energy models

The Salam-Sezgin model faces restrictions under these constraints

Implications for future string cosmology research

Abstract

It was recently pointed out that the existence of dark energy imposes highly restrictive constraints on effective field theories that satisfy the Swampland conjectures. We provide a critical confrontation of these constraints with the cosmological framework emerging from the Salam-Sezgin model and its string realization by Cvetic, Gibbons, and Pope. We also discuss the implication of the constraints for string model building.