| 1. |
- Gran, Ulf, 1973, et al.
(författare)
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IIB horizons
- 2013
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Ingår i: Classical and Quantum Gravity. - : IOP Publishing. - 0264-9381 .- 1361-6382. ; 30:20
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Tidskriftsartikel (refereegranskat)abstract
- We solve the Killing spinor equations for all near-horizon IIB geometries which preserve at least one supersymmetry. We show that generic horizon sections are eight-dimensional almost Hermitian spin(c) manifolds. Special cases include horizon sections with a Spin(7) structure and those for which the Killing spinor is pure. We also explain how the common sector horizons and the horizons with only 5-form flux are included in our general analysis. We investigate several special cases mainly focusing on the horizons with constant scalars admitting a pure Killing spinor and find that some of these exhibit a generalization of the 2-SCYT condition that arises in the horizons with 5-form fluxes only. We use this to construct new examples of near-horizon geometries with both 3-form and 5-form fluxes.
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| 2. |
- Gran, Ulf, 1973, et al.
(författare)
-
AdS backgrounds from black hole horizons
- 2013
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Ingår i: Classical and Quantum Gravity. - : IOP Publishing. - 0264-9381 .- 1361-6382. ; 30:5, s. Art. no. 055014-
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Tidskriftsartikel (refereegranskat)abstract
- We utilize the classification of IIB horizons with 5-form flux to present a unified description for the geometry of AdS(n), n = 3, 5, 7 solutions. In particular, we show that all such backgrounds can be constructed from eight-dimensional 2-strong Calabi-Yau geometries with torsion which admit some additional isometries. We explore the geometry of AdS(3) and AdS(5) solutions but we do not find AdS(7) solutions.
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| 3. |
- Gran, Ulf, 1973, et al.
(författare)
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On supersymmetric anti-de Sitter, de Sitter and Minkowski flux backgrounds
- 2018
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Ingår i: Classical and Quantum Gravity. - : IOP Publishing. - 0264-9381 .- 1361-6382. ; 35:6
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Tidskriftsartikel (refereegranskat)abstract
- We test the robustness of the conditions required for the existence of (supersymmetric) warped flux anti-de Sitter, de Sitter, and Minkowski backgrounds in supergravity theories using as examples suitable foliations of anti-de Sitter spaces. We find that there are supersymmetric de Sitter solutions in supergravity theories including maximally supersymmetric ones in 10- and 11-dimensional supergravities. Moreover, warped flux Minkowski backgrounds can admit Killing spinors which are not Killing on the Minkowski subspace and therefore cannot be put in a factorized form.
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