Vassiliev Invariants and the Loop States in Quantum Gravity

Details Vassiliev Invariants and the Loop States in Quantum Gravity Vassiliev Invariants and the Loop States in Quantum Gravity

1993-10-25

arxiv.org/abs/gr-qc/9310035v1

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

22 pages, to appear in Knots and Quantum Gravity, ed. John Baez, Oxford University Press, LaTeX

Scientific paper

An exposition of Vassiliev invariants is given in terms of the simplest approach to the functional integral construction of link invariants from Chern-Simons theory. This approach gives the top row evaluations of Vassiliev invariants for the classical Lie algebras, and a neat point of view on the results of Bar-Natan. It also clarifies the relation between Vassiliev invariants and the extension of the bracket invariant to links with transverse double points that appears in the work of Bruegmann, Gambini and Pullin on the loop representation of quantum gravity. We see that the Vassiliev vertex is not just a transversal intersection of Wilson loops, but rather has the structure of Casimir insertion (up to first order of approximation) coming from the difference formula in the functional integral. (Figures are available from the author.)

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