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Showing 1993Show all
3 papers · 1 filter
hep-th1993★ 8 cited
Invariants of Piecewise-Linear 3-Manifolds
John W. Barrett, Bruce W. Westbury
In this paper we develop a theory for constructing an invariant of closed oriented 3-manifolds, given a certain type of Hopf algebra. Examples are given by a quantised enveloping a…
gr-qc1993★ 68 cited
Semi-Classical Limits of Simplicial Quantum Gravity
J. W. Barrett, T. J. Foxon
We consider the simplicial state-sum model of Ponzano and Regge as a path integral for quantum gravity in three dimensions. We examine the Lorentzian geometry of a single 3-simplex…
hep-th1993★ 74 cited
Kleinian Geometry and the N=2 Superstring
J. Barrett, G. W. Gibbons, M. J. Perry +2
This paper is devoted to the exploration of some of the geometrical issues raised by the superstring. We begin by reviewing the reasons that -functions for the super…