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math-ph2011★ 2 cited
The Ponzano-Regge model and parametric representation
Dan Li
We give a parametric representation of the effective noncommutative field theory derived from a -deformation of the Ponzano-Regge model and define a generalized Kirchhoff polyno…
math-ph2011★ 2 cited
The algebraic geometry of Harper operators
Dan Li
Following an approach developed by Gieseker, Knörrer and Trubowitz for discretized Schrödinger operators, we study the spectral theory of Harper operators in dimension two and one,…