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1-loop graphs and configuration space integral for embedding spaces

Published online by Cambridge University Press:  10 January 2012

KEIICHI SAKAI  and
TADAYUKI WATANABE
KEIICHI SAKAI
Affiliation:
Department of Mathematical Sciences, Shinshu University, 3-1-1 Asahi, Matsumoto, Nagano 390-8621, Japan e-mail: ksakai@math.shinshu-u.ac.jp
TADAYUKI WATANABE
Affiliation:
Department of Mathematics, Hokkaido University, Kita 10, Nishi 8, Kita-Ku, Sapporo, Hokkaido, 060-0810, Japan e-mail: tadayuki@math.sci.hokudai.ac.jp
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Abstract

We will construct differential forms on the embedding spaces Emb(j, n) for n − j ≥ 2 using configuration space integral associated with 1-loop graphs, and show that some linear combinations of these forms are closed in some dimensions. There are other dimensions in which we can show the closedness if we replace Emb(j, n) by Emb(j, n), the homotopy fiber of the inclusion Emb(j, n) ↪ Imm(j, n). We also show that the closed forms obtained give rise to nontrivial cohomology classes, evaluating them on some cycles of Emb(j, n) and Emb(j, n). In particular we obtain nontrivial cohomology classes (for example, in H3(Emb(2, 5))) of higher degrees than those of the first nonvanishing homotopy groups.

Type
Research Article
Information
Mathematical Proceedings of the Cambridge Philosophical Society , Volume 152 , Issue 3 , May 2012 , pp. 497 - 533
Copyright
Copyright © Cambridge Philosophical Society 2012

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