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arXiv 1408.4632hep-th
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Toda场论中的膜瞬子

Membrane Instantons from Toda Field Theory

Ulrich Theis

摘要:

通过求解SU($\infty$)Toda方程确定了具有等距的四维四元数Kaehler度规.我们建立了一个微扰理论来构造后者的近似解,它可以被解释为膜瞬子修正的通用超多重态的模空间度量。我们计算一个这样的解决方案,完全达到五个瞬子水平,包括所有的扰动波动的瞬子。结果显示了一种模式,使我们能够确定在这个解决方案中的所有更高的瞬子校正的渐近行为。我们发现后者的首项的生成函数由Lambert W函数给出。

英文摘要:

Four-dimensional quaternion-Kaehler metrics with an isometry are determined by solutions to the SU($\infty$) Toda equation. We set up a perturbation theory to construct approximate solutions to the latter which can be interpreted as membrane instanton corrections to the moduli space metric of the universal hypermultiplet. We compute one such solution exactly up to the five-instanton level, including all perturbative fluctuations about the instantons. The result shows a pattern that allows us to determine the asymptotic behaviour of all higher instanton corrections within this solution. We find that the generating function for the leading terms of the latter is given by the Lambert W-function.

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