https://doi.org/10.1140/epjc/s10052-025-13915-6
Regular Article - Theoretical Physics
On scale-separated supersymmetric 
flux vacua
1
Institute for Theoretical Physics, KU Leuven, Celestijnenlaan 200D, 3001, Leuven, Belgium
2
Max-Planck-Institut für Physik (Werner-Heisenberg-Institut), Boltzmannstraße 8, 85748, Garching, Germany
3
Physics Division, National Technical University of Athens, Zografou Campus, 15780, Athens, Greece
a
niccolo.cribiori@kuleuven.be
Received:
15
November
2024
Accepted:
7
February
2025
Published online:
25
February
2025
We argue that scale-separated vacua with at least two preserved supercharges cannot arise from flux compactifications in a regime of computational control. We deduce this by showing that the scale is parametrically of the same order as the tension of a fundamental BPS domain wall, which provides an upper bound on the UV cutoff. Since the latter does not need to be associated to any geometric scale, the argument excludes scale separation in a broader sense than what commonly considered. Our claim is exemplified by a bottom-up 2D supergravity analysis as well as top-down models from Type II flux compactifications.
© The Author(s) 2025
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