Killing Spinors -- Beyond Supergravity

TL;DR

This thesis explores advanced techniques involving Killing spinors to classify supersymmetric solutions in supergravity and applies these methods to broader geometric and physical contexts beyond traditional supergravity frameworks.

Contribution

It introduces new methods for using Killing spinors to find solutions in Einstein-Maxwell-De Sitter theories and classifies Lorentzian Einstein-Weyl manifolds, extending their applications beyond supergravity.

Findings

Solutions to Einstein-Maxwell-De Sitter theories obtained.

Partial classification of Lorentzian Einstein-Weyl manifolds achieved.

New geometric techniques for analyzing supersymmetric backgrounds introduced.

Abstract

This is a doctoral thesis on the application of techniques originally developed in the programme of characterisation of supersymmetric solutions to Supergravity theories, to finding alternative backgrounds. We start by discussing the concept of a Killing spinor, and how these are paramount to the process of classifying the aforementioned supersymmetric solutions. Moreover, these geometric objects also have applications when considered in different scenarios (the 'beyond' in the title). In particular, techniques based on a different parallelising rule for a spinorial field can be used for obtaining solutions to Einstein-Maxwell-De Sitter theories, as well as a (partial) classification of lorentzian Einstein-Weyl manifolds, a problem of geometrical interest. The annexe contain an introduction and summary in Spanish language. The appendices discuss the tensorial and spinorial conventions employed, some relevant geometrical information on the scalar manifolds for the matter contents of interest, as well as for the null case solutions, including Kundt waves. Also, a short introduction to Weyl geometry and the Similitude group, as well as the Lorentz and Spin groups, is given.