Metric bundles of split signature and type II supergravity

Details Metric bundles of split signature and type II supergravity Metric bundles of split signature and type II supergravity

2006-10-11

arxiv.org/abs/math/0610380v3

In: H. Baum, D. Alekseevsky (ed.), Recent Developments in Pseudo-Riemannian Geometry pp. 455-494, EMS 2008

Mathematics

Differential Geometry

40 pages

Scientific paper

We study the geometry of type II supergravity compactifications in terms of an oriented vector bundle $E$, endowed with a bundle metric of split signature and further datum. The geometric structure is associated with a so-called generalised $G$-structure and characterised by an $E$-spinor $\rho$, which we can regard as a differential form of mixed degree. This enables us to reformulate the field equations of type II supergravity as an integrability condition of type $d_H\rho=0$, where $d_H=d+H\wedge$ is the twisted differential on forms. Finally, we investigate some geometric properties of integrable structures and formulate various no-go theorems.

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