Radiative Generation of dS from AdS

TL;DR

This paper explores how radiative corrections in string compactifications can generate a positive cosmological constant from an initially negative one, potentially challenging the deSitter swampland conjecture.

Contribution

It demonstrates that radiative effects below the KK scale can alter the sign of the cosmological constant in LVS models, under certain spectral conditions.

Findings

Radiative corrections can flip the sign of the cosmological constant.

String theory's negative CC can become positive through low-energy fluctuations.

Implications for the deSitter swampland conjecture are discussed.

Abstract

The large volume scenario (LVS) of type IIB string compactifications has a robust supersymmetry breaking minimum with a negative cosmological constant (CC). We argue that radiative corrections below the Kaluza-Klein (KK) scale can result in a positive CC, though the string theory generated CC is negative, if some mild conditions on the spectrum of low energy fluctuations are satisfied. This would make the so-called deSitter swampland conjecture (even if true at a high scale) physically irrelevant.