Abstract
We obtain the bosonic Lagrangians of vector and hypermultiplets coupled to four-dimensional \( \mathcal{N} \) = 2 supergravity in signatures (0, 4), (1, 3) and (2,2) by compactification of type-II string theories in signatures (0,10), (1,9) and (2,8) on a Calabi-Yau threefold. Depending on the signature and the distinctions between type-IIA/IIA*/IIB/IIB*/IIB’ the resulting scalar geometries are special Kähler or special para-Kähler for vector multiplets and quaternion-Kähler or para-quaternion Kähler for hypermultiplets. By spacelike and timelike reductions we obtain three-dimensional \( \mathcal{N} \) = 4 supergravity theories coupled to two sets of hypermultiplets. We determine the c-maps relating vector to hypermultiplets, and show how the four-dimensional theories are related by spacelike, timelike and mixed, signature-changing T-dualities.
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Médevielle, M., Mohaupt, T. & Pope, G. Type-II Calabi-Yau compactifications, T-duality and special geometry in general spacetime signature. J. High Energ. Phys. 2022, 48 (2022). https://doi.org/10.1007/JHEP02(2022)048
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DOI: https://doi.org/10.1007/JHEP02(2022)048