Algebraic Structures in M-theory

Examensarbete för masterexamen

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Type: Examensarbete för masterexamen
Master Thesis
Title: Algebraic Structures in M-theory
Authors: Bao, Ling
Abstract: In this thesis we reformulate the bosonic sector of eleven dimensional supergravity as a simultaneous nonlinear realisation based on the conformal group and an enlarged affine group called G_{11}. The vielbein and the gauge fields of the theory appear as space-time dependent parameters of the coset representatives. Inside the corresponding algebra g_{11} we find the Borel subalgebra of e_7, whereas performing the same procedure for the Borel subalgebra of e_8 we have to add some extra generators. The presence of these new generators lead to a new formulation of gravity, which includes both a vielbein and its dual. We make the conjecture that the final symmetry of M-theory should be described by a coset space, with the global and the local symmetry given by the Lorentzian Kac-Moody algebra e_{11} and its subalgebra invariant under the Cartan involution, respectively. The pure gravity itself in $D$ dimensions is argued to have a coset symmetry based on the very extended algebra A^{+++}_{D-3}. The tensor generators of a very extended algebra are divided into representations of its maximal finite dimensional subalgebra. The space-time translations are thought to be introduced as weights in a basic representation of the Kac-Moody algebra. Some features of the root system of a general Lorentzian Kac-Moody algebra are discussed, in particular those related to even self-dual lattices.
Keywords: Fysik;Physical Sciences
Issue Date: 2004
Publisher: Chalmers tekniska högskola / Institutionen för teoretisk fysik och mekanik
Chalmers University of Technology / Department of Theoretical Physics and Mechanics
URI: https://hdl.handle.net/20.500.12380/1655
Collection:Examensarbeten för masterexamen // Master Theses



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