Subsectors, Dynkin Diagrams and New Generalised Geometries

Oct 15, 2013
39 pages
Published in:
  • JHEP 08 (2017) 144
  • Published: Aug 31, 2017
e-Print:
Report number:
  • ZMP-HH-13-19

Citations per year

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Abstract: (Springer)
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 Spin(d, d) × 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 exam-ples 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.
Note:
  • 42 pages, v2: minor improvements and changes, published version
  • Differential and Algebraic Geometry
  • Flux compactifications
  • M-Theory
  • Supergravity Models
  • spinor: representation
  • group: representation
  • dimension: 8
  • geometry
  • gravitation
  • gauge field theory