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arXiv 0811.0606math.GT
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Casson-Walker不变量的一个简单公式

A simple formula for the Casson-Walker invariant

Sergei Matveev, Michael Polyak

摘要:

高斯图公式被广泛用于研究瓦西里耶夫链不变量。现在我们将这种方法应用于3-流形的不变量,考虑3-球面中框架链接上的手术给出的流形。我们研究了最低程度的情况下,著名的卡森-沃克不变量的合理的同源领域。本文致力于2-分量链路的详细处理,一般情况下将被视为在即将举行的文件。我们提出了简单的高斯图公式的卡森-沃克不变量。这使我们能够理解/分离它对非框架链接和框架的依赖。我们还得到了交叉变化下的卡森-沃克不变量的绞关系,并研究了其渐近行为时,框架趋于无穷大。最后,我们提出了广泛的计算机计算的结果。

英文摘要:

Gauss diagram formulas are extensively used to study Vassiliev link invariants. Now we apply this approach to invariants of 3-manifolds, considering manifolds given by surgery on framed links in the 3-sphere. We study the lowest degree case - the celebrated Casson-Walker invariant of rational homology spheres. This paper is dedicated to a detailed treatment of 2-component links; a general case will be considered in a forthcoming paper. We present simple Gauss diagram formulas for the Casson-Walker invariant. This enables us to understand/separate its dependence on the unframed link and on the framings. We also obtain skein relations for the Casson-Walker invariant under crossing changes, and study its asymptotic behavior when framings tend to infinity. Finally, we present results of extensive computer calculations.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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