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arXiv 0908.1923hep-th
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超对称弦和场论中四胶子散射的非重整化条件

Non-renormalization conditions for four-gluon scattering in supersymmetric string and field theory

Nathan Berkovits, Michael B. Green, Jorge G. Russo, Pierre Vanhove

摘要:

利用纯旋量形式研究了U(N)理论中极大超对称性对四开超弦散射的多圈贡献的限制。双迹项k^2 t_8(tr F^2)^2(其中k表示外部动量,F表示杨-米尔斯场强度)只接受来自L<=2(其中L是回路数)的贡献,而单迹项k^2 t_8(tr F^4)接受来自所有L的贡献。我们在L=5时验证了这些说法,但基于超对称性的论证表明它们可以扩展到所有L。这就解释了为什么单迹对低能最大超对称杨-米尔斯场论的贡献在紫外区比双迹贡献更发散。我们还进一步评论的限制,闭弦振幅和它们的影响,紫外发散在N=8超引力。

英文摘要:

The constraints imposed by maximal supersymmetry on multi-loop contributions to the scattering of four open superstrings in the U(N) theory are examined by use of the pure spinor formalism. The double-trace term k^2 t_8(tr F^2)^2 (where k represents an external momentum and F the Yang--Mills field strength) only receives contributions from L<=2 (where L is the loop number) while the single-trace term k^2 t_8(tr F^4) receives contributions from all L. We verified these statements up to L=5, but arguments based on supersymmetry suggest they extend to all L. This explains why the single-trace contributions to low energy maximally supersymmetric Yang--Mills field theory are more divergent in the ultraviolet than the double-trace contributions. We also comment further on the constraints on closed string amplitudes and their implications for ultraviolet divergences in N=8 supergravity.

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