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arXiv 1204.4785hep-thmath.QA
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HOMFLY多项式的特征展开。III。第一个对称表示中的所有3股编织物

Character expansion for HOMFLY polynomials. III. All 3-Strand braids in the first symmetric representation

H. Itoyama, A. Mironov, A. Morozov, An. Morozov

摘要:

我们继续系统地研究扩展HOMFLY多项式的程序。扩展多项式依赖于无穷多个时间变量,是可积τ函数的近亲,并且依赖于纽结的辫子表示的选择。它们具有自然的特征分解,其系数可以由辫子中任意特定股数m和李代数GL(\infty)的任意特定表示R的穷举通式定义。由于被限制在时间变量空间中的“拓扑轨迹”,扩展的HOMFLY多项式再现了普通的纽结不变量。当m=3时,当辫子由整数序列(a_1,b_1,a_2,b_2,.)参数化时,我们导出了这样一个一般公式,对于第一非基本表示R=[2]。而不是直接计算的混合矩阵,我们推导出他们从比较与已知的答案环面和复合结。一个简单的反射对称将对称表示[2]的答案转换为反对称表示[1,1]的答案。结果特别适用于8字形结4_1,并进一步扩展到arXiv:1203.5978中任意对称和反对称表示的超多项式。

英文摘要:

We continue the program of systematic study of extended HOMFLY polynomials. Extended polynomials depend on infinitely many time variables, are close relatives of integrable tau-functions, and depend on the choice of the braid representation of the knot. They possess natural character decompositions, with coefficients which can be defined by exhaustively general formula for any particular number m of strands in the braid and any particular representation R of the Lie algebra GL(\infty). Being restricted to "the topological locus" in the space of time variables, the extended HOMFLY polynomials reproduce the ordinary knot invariants. We derive such a general formula, for m=3, when the braid is parameterized by a sequence of integers (a_1,b_1,a_2,b_2,...), and for the first non-fundamental representation R=[2]. Instead of calculating the mixing matrices directly, we deduce them from comparison with the known answers for torus and composite knots. A simple reflection symmetry converts the answer for the symmetric representation [2] into that for the antisymmetric one [1,1]. The result applies, in particular, to the figure eight knot 4_1, and was further extended to superpolynomials in arbitrary symmetric and antisymmetric representations in arXiv:1203.5978.

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