University of Hertfordshire

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Subsectors, Dynkin Diagrams and New Generalised Geometries

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Original languageEnglish
Article number144
Number of pages35
JournalJHEP
Volume2017
Issue8
Early online date31 Aug 2017
DOIs
Publication statusE-pub ahead of print - 31 Aug 2017

Abstract

We examine how generalised geometries can be associated with a labelled Dynkin diagram built around a gravity line. We present a series of new generalised geometries based on the groups $\mathit{Spin}(d,d)\times\mathbb{R}^+$ for which the generalised tangent space transforms in a spinor representation of the group. In low dimensions these all appear in subsectors of maximal supergravity theories. The case $d=8$ provides a geometry for eight-dimensional backgrounds of M theory with only seven-form flux, which have not been included in any previous geometric construction. This geometry is also one of a series of "half-exceptional" geometries, which "geometrise" a six-form gauge field. In the appendix, we consider examples of other algebras appearing in gravitational theories and give a method to derive the Dynkin labels for the "section condition" in general. We argue that generalised geometry can describe restrictions and subsectors of many gravitational theories.

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© The Author(s) 2017.

ID: 16189428