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arXiv 1602.01674hep-thgr-qc
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弦相互作用中的普适性

Universality in string interactions

Yu-tin Huang, Oliver Schlotterer, Congkao Wen

摘要:

在这封信中,我们提供了证据的普遍性,在低能量膨胀的树级弦相互作用。更确切地说,在树能级散射振幅的α '展开中,我们猜想α'中每一阶的领先超越系数对于所有微扰弦论是普适的。我们已经检查了这种普遍性多达七点,并将其起源追溯到将开玻色弦的圆盘积分重构为超弦的圆盘积分的能力。伴随的运动学函数具有相同的低能极限,并且在它们的α '-修正中不引入任何超越数。闭弦扇区中的普适性则由KLT关系推出。

英文摘要:

In this letter, we provide evidence for universality in the low-energy expansion of tree-level string interactions. More precisely, in the alpha'-expansion of tree-level scattering amplitudes, we conjecture that the leading transcendental coefficient at each order in alpha' is universal for all perturbative string theories. We have checked this universality up to seven points and trace its origin to the ability to restructure the disk integrals of open bosonic string into those of the superstring. The accompanying kinematic functions have the same low-energy limit and do not introduce any transcendental numbers in their alpha'-corrections. Universality in the closed-string sector then follows from the KLT-relations.

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