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arXiv 1012.5485math-phhep-thmath.AGmath.MP
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Feynman积分与位形空间的基元

Feynman integrals and motives of configuration spaces

Ozgur Ceyhan, Matilde Marcolli

摘要:

我们在位形空间而不是动量空间中阐述了费曼积分的重整化问题及其与动力周期的关系。代数几何设置提供了美妙的紧化安排的子品种相关的子图的费曼图和(准)投射品种。利用李力的最新结果,根据簇的动机和Feynman图的组合学,对这些奇妙的紧化,明确地计算了Grothendieck环中的动机和类.由非重整化费曼振幅定义的形式的奇妙紧化的拉回沿着超曲面具有奇点,其实轨迹包含在给出奇妙紧化的迭代爆破的例外因子中。费曼积分的正则化可以通过修改积分的循环来获得,通过用Leray上边界代替发散轨迹。然后用庞加莱残基定义了模糊性。虽然这些留数给出了与例外因子及其交集的上同调相关的混合泰特周期,但正则化积分在奇妙的紧化中产生了超曲面补的周期,这可能会更加复杂。

英文摘要:

We formulate the problem of renormalization of Feynman integrals and its relation to periods of motives in configuration space instead of momentum space. The algebro-geometric setting is provided by the wonderful compactifications of arrangements of subvarieties associated to the subgraphs of a Feynman graph and a (quasi)projective variety. The motive and the class in the Grothendieck ring are computed explicitly for these wonderful compactifications, in terms of the motive of the variety and the combinatorics of the Feynman graph, using recent results of Li Li. The pullback to the wonderful compactification of the form defined by the unrenormalized Feynman amplitude has singularities along a hypersurface, whose real locus is contained in the exceptional divisors of the iterated blowup that gives the wonderful compactification. A regularization of the Feynman integrals can be obtained by modifying the cycle of integration, by replacing the divergent locus with a Leray coboundary. The ambiguities are then defined by Poincare' residues. While these residues give mixed Tate periods associated to the cohomology of the exceptional divisors and their intersections, the regularized integrals give rise to periods of the hypersurface complement in the wonderful compactification, which can be motivically more complicated.

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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