We study the relationship between trivial cocycles on the Torelli group and invariants of oriented integral homology 3-spheres. We apply this study to give a new purely algebraic construction of the Casson invariant. As a by-product we get a new 2-torsion cohomology class in the second integral cohomology of the Torelli group. (c) 2008 Elsevier Inc. All rights reserved.
机构:
ECOLE NORMALE SUPER LYON,DEPT MATH & INFORMAT,CNRS,UA 746,F-69364 LYON 07,FRANCEECOLE NORMALE SUPER LYON,DEPT MATH & INFORMAT,CNRS,UA 746,F-69364 LYON 07,FRANCE
机构:
Osaka City Univ, Dept Math, Sumiyoshi Ku, Sugimoto, Osaka 5588585, Japan
Kyoto Univ, Math Sci Res Inst, Sakyo Ku, Kyoto 6068502, JapanOsaka City Univ, Dept Math, Sumiyoshi Ku, Sugimoto, Osaka 5588585, Japan
Kuriya, Takahito
Le, Thang T. Q.
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Georgia Tech, Sch Math, Atlanta, GA 30332 USAOsaka City Univ, Dept Math, Sumiyoshi Ku, Sugimoto, Osaka 5588585, Japan
Le, Thang T. Q.
Ohtsuki, Tomotada
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Kyoto Univ, Math Sci Res Inst, Sakyo Ku, Kyoto 6068502, JapanOsaka City Univ, Dept Math, Sumiyoshi Ku, Sugimoto, Osaka 5588585, Japan