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arXiv 0809.2619hep-thcond-mat.stat-mechmath-phmath.MPnlin.SI
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多瞬子和多切割

Multi-Instantons and Multi-Cuts

Marcos Marino, Ricardo Schiappa, Marlene Weiss

摘要:

我们讨论了多瞬子组态在一般多切割矩阵模型的各个方面。给出了两割情形下的显式公式,特别地,作为两割情形的退化,我们得到了单割矩阵模型情形下多瞬子振幅的一般公式。这些公式表明,由于矩阵模型本征值之间的排斥,瞬子气体是超稀的。我们在立方矩阵模型中验证了我们的一般结果,其中多瞬子振幅也可以用正交多项式计算。作为应用,我们推导了二维量子引力中多瞬子贡献的一般表达式,并通过计算弦方程的瞬子修正来验证。由此产生的振幅可以被解释为多个ZZ-膜的正则化配分函数,它充分考虑了它们对目标几何的反作用。最后,我们还得到了Painleve I方程的反级数解的结构性质。

英文摘要:

We discuss various aspects of multi-instanton configurations in generic multi-cut matrix models. Explicit formulae are presented in the two-cut case and, in particular, we obtain general formulae for multi-instanton amplitudes in the one-cut matrix model case as a degeneration of the two-cut case. These formulae show that the instanton gas is ultra-dilute, due to the repulsion among the matrix model eigenvalues. We exemplify and test our general results in the cubic matrix model, where multi-instanton amplitudes can be also computed with orthogonal polynomials. As an application, we derive general expressions for multi-instanton contributions in two-dimensional quantum gravity, verifying them by computing the instanton corrections to the string equation. The resulting amplitudes can be interpreted as regularized partition functions for multiple ZZ-branes, which take into full account their back-reaction on the target geometry. Finally, we also derive structural properties of the trans-series solution to the Painleve I equation.

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