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Universality in string interactions

MPS-Authors
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Schlotterer,  Oliver
Quantum Gravity and Unified Theories, AEI Golm, MPI for Gravitational Physics, Max Planck Society;

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Fulltext (public)

1602.01674.pdf
(Preprint), 153KB

JHEP09(2016)155.pdf
(Publisher version), 333KB

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Citation

Huang, Y.-t., Schlotterer, O., & Wen, C. (2016). Universality in string interactions. Journal of high energy physics: JHEP, 2016(09): 155. doi:10.1007/JHEP09(2016)155.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002A-0BC1-2
Abstract
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.