Dark energy, Ricci-nonflat spaces, and the swampland

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. (C) 2021 The Authors. Published by Elsevier B.V.

Automated summary

The existence of dark energy imposes strict constraints on effective field theories that satisfy the Swampland conjectures, which is crucial for string model building.