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arXiv 0806.1681hep-thmath-phmath.MP
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Feynman图的超流形

Supermanifolds from Feynman graphs

Matilde Marcolli, Abhijnan Rej

摘要:

我们推广的费曼积分的计算日志发散图的Kirchhoff多项式的情况下,图的费米子和玻色子的边缘,我们分配一组普通和格拉斯曼变量。这个过程给出了一个计算的费曼积分在一个时期的一个supermanifold,图承认的基础上的第一个同源满足条件推广的日志分歧在这方面。图超曲面在这种情况下的类似物是一个图超流形,它由超投射空间中与图相关联的矩阵的Berezian的零和极点的除数给出。我们引入了一个Grothendieck群的超流形,我们确定的子群生成的图超流形。这可以被看作是构造具有相关周期的有趣的超流形类的一般过程。

英文摘要:

We generalize the computation of Feynman integrals of log divergent graphs in terms of the Kirchhoff polynomial to the case of graphs with both fermionic and bosonic edges, to which we assign a set of ordinary and Grassmann variables. This procedure gives a computation of the Feynman integrals in terms of a period on a supermanifold, for graphs admitting a basis of the first homology satisfying a condition generalizing the log divergence in this context. The analog in this setting of the graph hypersurfaces is a graph supermanifold given by the divisor of zeros and poles of the Berezinian of a matrix associated to the graph, inside a superprojective space. We introduce a Grothendieck group for supermanifolds and we identify the subgroup generated by the graph supermanifolds. This can be seen as a general procedure to construct interesting classes of supermanifolds with associated periods.

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