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Unorientable supersymmetric compactifications of M-theory

Ilarion V. Melnikov, Ruben Minasian

hep-tharXiv:2609.10272

Abstract

We discuss orbifold compactifications of the type II string, where the orbifold combines a free action on a base manifold and the (-1)FL symmetry which acts by -1 on left-moving Ramond sectors. Such backgrounds can preserve minimal supersymmetry and lift to M-theory compactification on smooth unorientable manifolds.

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