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arXiv math-ph/0602004math-phhep-thmath.MP
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Birkhoff型分解与Baker-Campbell-Hausdorff递归

Birkhoff type decompositions and the Baker-Campbell-Hausdorff recursion

K. Ebrahimi-Fard, L. Guo, D. Manchon

摘要:

我们描述了一个统一的几个显然无关的因式分解所产生的量子场论,顶点算子代数,组合数学和数值方法在微分方程。统一是由Birkhoff型分解给出的,该分解是在我们研究Connes和Kreimer的扰动量子场论重整化的Hopf代数方法时由Baker-Campbell-Hausdorff公式得到的。证明了Connes和Kreimer的Birkhoff分解可以由一个具有Rota-Baxter算子的Baker-Campbell-Hausdorff递推公式得到。我们将解释相同的分解如何推广形式指数的因式分解和顶点算子代数和共形场论中出现的李代数的一致化,组合Hopf代数特征的奇偶分解以及常微分方程中矩阵指数近似的李代数极分解。

英文摘要:

We describe a unification of several apparently unrelated factorizations arisen from quantum field theory, vertex operator algebras, combinatorics and numerical methods in differential equations. The unification is given by a Birkhoff type decomposition that was obtained from the Baker-Campbell-Hausdorff formula in our study of the Hopf algebra approach of Connes and Kreimer to renormalization in perturbative quantum field theory. There we showed that the Birkhoff decomposition of Connes and Kreimer can be obtained from a certain Baker-Campbell-Hausdorff recursion formula in the presence of a Rota-Baxter operator. We will explain how the same decomposition generalizes the factorization of formal exponentials and uniformization for Lie algebras that arose in vertex operator algebra and conformal field theory, and the even-odd decomposition of combinatorial Hopf algebra characters as well as to the Lie algebra polar decomposition as used in the context of the approximation of matrix exponentials in ordinary differential equations.

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