Weak gravity versus scale separation

Abstract

We give evidence that fully supersymmetric Anti-de Sitter vacua of extended supergravity with a residual gauge group containing an abelian factor cannot be scale separated as a consequence of the weak gravity conjecture. We prove this for N=2 and N=8 supergravity and we explain how our argument applies also to vacua with partially broken, but extended residual supersymmetry. We finally discuss possible loopholes and especially how certain N=1 models can evade our reasoning. Our results suggest that N=0,1 supersymmetry at the lagrangian level might be the most promising chances to obtain a truly four-dimensional effective description of quantum gravity.

23 pages, 9 tables; v2: references added, minor modifications, published on JHEP

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• Type IIB flux compactifications with $h^{1,1}=0$
• Self-Binding Energies in AdS
• Exploring the landscape of (anti-) de Sitter and Minkowski solutions: group manifolds, stability and scale separation
• Asymptotic safety, quantum gravity, and the swampland: a conceptual assessment