State sums and geometry

Hellmann, Frank (2011) State sums and geometry. PhD thesis, University of Nottingham.

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Abstract

In this thesis I review the definition of topological quantum field theories through state sums on triangulated manifolds. I describe the construction of state sum invariants of 3-manifolds from a graphical calculus and show how to evaluate the invariants as boundary amplitudes. I review how to define such a graphical calculus through SU(2) representation theory. I then review various geometricity results for the representation theory of SU(2), Spin(4) and SL(2,C), and define coherent boundary manifolds for state sums based on these representations. I derive the asymptotic geometry of the SU(2) based Ponzano-Regge invariant in three dimensions, and the SU(2) based Ooguri models amplitude in four dimensions. As a corollary to the latter results I derive the asymptotic behaviour of various recently proposed spin foam models motivated from the Plebanski formulation of general relativity. Finally the asymptotic geometry of the SL(2,C) based model is derived.

Item Type:Thesis (PhD)
Supervisors:Barrett, J.W.
Faculties/Schools:UK Campuses > Faculty of Science > School of Mathematical Sciences
ID Code:1803
Deposited By:Frank Hellmann
Deposited On:17 Oct 2011 10:48
Last Modified:17 Oct 2011 10:48

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