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math-ph2004★ 11 cited
Discrete Differential Geometry on causal graphs
Eric Forgy, Urs Schreiber
Differential calculus on discrete spaces is studied in the manner of non-commutative geometry by representing the differential calculus by an operator algebra on a suitable Krein s…
math-ph2004★ 3 cited
Pohlmeyer invariants are expressible in terms of DDF invariants
Urs Schreiber
It is shown that the Pohlmeyer invariants of the classical bosonic string are a proper subset of the classical DDF invariants. This makes the quantization of the Pohlmeyer invarian…