Generalised Geometry of Supergravity

Aug, 2012
182 pages
Thesis: PhD
  • Imperial Coll., London
(2012)
  • Published: Aug, 2012
URN/HDL:

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Abstract: (Imperial Coll., London)
We reformulate type II supergravity and dimensional restrictions of eleven-dimensionalsupergravity as generalised geometrical analogues of Einsteingravity. The bosonic symmetries are generated by generalised vectors, whilethe bosonic fields are unified into a generalised metric. The generalised tangentspace features a natural action of the relevant (continuous) dualitygroup. Also, the analogues of orthonormal frames for the generalised metricare related by the well-known enhanced local symmetry groups, whichprovide the analogue of the local Lorentz symmetry in general relativity.Generalised connections and torsion feature prominently in the construction,and we show that the analogue of the Levi-Civita connection is notuniquely determined by metric compatibility and vanishing torsion. However,connections of this type can be used to extract the derivative operatorswhich appear in the supergravity equations, and the undetermined piecesof the connection cancel out from these, leaving the required unique expressions.We find that the bosonic action and equations of motion can be interpretedas generalised curvatures, while the derivative operators appearingin the supersymmetry variations and equations of motion for the fermionsbecome very simple expressions in terms of the generalised connection.In the final chapter, the construction is used to reformulate supersymmetricflux backgrounds as torsion-free generalised G-structures. This isthe direct analogue of the special holonomy condition which arises for supersymmetricbackgrounds without flux in ordinary Riemannian geometry.
  • operator: derivative
  • symmetry: Lorentz
  • flux: background
  • gauge field theory: boson
  • dimension: 11
  • supergravity: Type II
  • torsion
  • differential geometry
  • thesis