Systematics of IIB spinorial geometry

TL;DR

This paper systematically reduces the classification of IIB supergravity backgrounds to solving linear systems derived from Killing spinor equations, simplifying the analysis of supersymmetric solutions and their geometric and field configurations.

Contribution

It extends previous work by formulating explicit linear systems for all five types of spinors in IIB supergravity, enabling detailed analysis of supersymmetric backgrounds.

Findings

Derived explicit Killing spinor equations for all five spinor types.

Solved equations for backgrounds with specific invariant Killing spinors.

Identified field equations implied by supersymmetry constraints.

Abstract

We reduce the classification of all supersymmetric backgrounds of IIB supergravity to the evaluation of the Killing spinor equations and their integrability conditions, which contain the field equations, on five types of spinors. This extends the work of [hep-th/0503046] to IIB supergravity. We give the expressions of the Killing spinor equations on all five types of spinors. In this way, the Killing spinor equations become a linear system for the fluxes, geometry and spacetime derivatives of the functions that determine the Killing spinors. This system can be solved to express the fluxes in terms of the geometry and determine the conditions on the geometry of any supersymmetric background. Similarly, the integrability conditions of the Killing spinor equations are turned into a linear system. This can be used to determine the field equations that are implied by the Killing spinor equations for any supersymmetric background. We show that these linear systems simplify for generic backgrounds with maximal and half-maximal number of $H$-invariant Killing spinors, $H\subset Spin(9,1)$. In the maximal case, the Killing spinor equations factorize, whereas in the half-maximal case they do not. As an example, we solve the Killing spinor equations of backgrounds with two $SU(4)\ltimes \bR^8$-invariant Killing spinors. We also solve the linear systems associated with the integrability conditions of maximally supersymmetric $Spin(7)\ltimes\bR^8$- and $SU(4)\ltimes\bR^8$-backgrounds and determine the field equations that are not implied by the Killing spinor equations.