Polynomial 6j–symbols and states sums

Polynomial 6j–symbols and states sums
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多项式 6j – 符号和状态和

DOI:
10.2140/agt.2011.11.1821
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发表时间:
2009
影响因子:
0.7
通讯作者:
Bertrand Patureau
Bertrand Patureau
中科院分区:
数学3区
文献类型:
--
作者:
Nathan Geer;Bertrand Patureau

文献摘要

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对于2 r阶单位根q,给出了一族系数在Z[q]中的三元Laurent多项式J_{i,j,k}的显式表达式,它编码了U_qsl_2的幂零表示的6 j-符号.对于给定的阿贝尔群G,我们利用它们来产生一个四元组(紧3流形M,M内的链L,H1(M,Z)中的同调类h1\inH2(M,G)中的同调类h2\inH1(M,Z))的状态和不变量τ ^r(M,L,h1,h2),其值在与G相关的环R中.这些公式是通过“skein "微积分建立的,作为[arXiv:0711.4229]中引入的修改维数理论的应用。对于定向3-流形M,不变量与来自U_qsl_2的幂零表示范畴的在[arXiv:0910.1624]中定义的TV(M,L,f\in H^1(M,C^*))相关。他们将它们改进为TV(M,L,f)= Sum_h τ ^r(M,L,h,f ')其中f'对应于同构为H_2(M,C^*)~ H^1(M,C^*)的f。
For q a root of unity of order 2r, we give explicit formulas of a family of 3-variable Laurent polynomials J_{i,j,k} with coefficients in Z[q] that encode the 6j-symbols associated with nilpotent representations of U_qsl_2. For a given abelian group G, we use them to produce a state sum invariant tau^r(M,L,h_1,h_2) of a quadruplet (compact 3-manifold M, link L inside M, homology class h_1\in H_1(M,Z), homology class h_2\in H_2(M,G)) with values in a ring R related to G. The formulas are established by a ''skein'' calculus as an application of the theory of modified dimensions introduced in [arXiv:0711.4229]. For an oriented 3-manifold M, the invariants are related to TV(M,L,f\in H^1(M,C^*)) defined in [arXiv:0910.1624] from the category of nilpotent representations of U_qsl_2. They refine them as TV(M,L,f)= Sum_h tau^r(M,L,h,f') where f' correspond to f with the isomorphism H_2(M,C^*) ~ H^1(M,C^*).