Validity of the domain wall bound in KKLT-type AdS vacua with warped throats

Ascertain whether KKLT-type anti–de Sitter vacua that include strongly warped throats (such as those constructed by McAllister, Moritz, Nally, and Schachner) ultimately satisfy the domain wall bound Λ_UV^3 ≤ M_Pl,4^2 L_AdS^{-1} once all contributions from localized throat fluxes and associated domain-wall processes are properly accounted for.

Background

In warped throat geometries, local Kaluza–Klein towers redshift, lowering the effective UV cutoff and potentially restoring the domain wall bound that is violated in unwarped KKLT-like constructions with exponentially small cosmological constant.

The authors note subtleties: it is assumed that throat-localized 3-form fluxes do not contribute to the Gukov–Vafa–Witten superpotential W0, but domain wall processes changing throat flux still affect the vacuum energy and uplift. Given these complexities, the authors state that it is not clear whether warped models obey the bound with certainty.