NONTRIVIAL CLASSES IN H( Imb (S,R)) FROM NONTRIVALENT GRAPH COCYCLES
نویسنده
چکیده
We construct nontrivial cohomology classes of the space Imb (S, Rn) of imbeddings of the circle into Rn, by means of Feynman diagrams. More precisely, starting from a suitable linear combination of nontrivalent diagrams, we construct, for every even number n ≥ 4, a de Rham cohomology class on Imb (S, Rn). We prove nontriviality of these classes by evaluation on the dual cycles.
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