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arXiv 2006.15652math-phhep-thmath.MPnlin.SI
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不规则共形块、Painlevé III和爆破方程

Irregular conformal blocks, Painlevé III and the blow-up equations

Pavlo Gavrylenko, Andrei Marshakov, Artem Stoyan

摘要:

研究了不规则共形块体与Painlevé III $_3$方程的关系。准经典不规则块的泛函表示与共形场论的BPZ方程和Painlevé III $_3$的Hamilton-Jacobi方法是一致的。它直接导致了4d纯超对称规范理论的对偶Nekrasov配分函数的爆破方程的极限情况,它甚至可以被视为$c=1$和$c\to\infty$共形块的定义方程组。我们将这一分析推广到强耦合区域,其中共形块和Nekrasov函数的原始定义是未知的,并将结果应用于Matheiu方程的谱问题。最后,我们提出了在强耦合区通过量子化Painlevé III $_3$方程构造不规则共形块的方法,并由此得到了一般表达式,作为其特例,再现了$c=1$和准经典$c\to\infty$的结果.对于某些特殊点,我们还找到了$c=1$和$c=-2$不规则块在无穷远处的显式积分表示.

英文摘要:

We study the relation of irregular conformal blocks with the Painlevé III$_3$ equation. The functional representation for the quasiclassical irregular block is shown to be consistent with the BPZ equations of conformal field theory and the Hamilton-Jacobi approach to Painlevé III$_3$. It leads immediately to a limiting case of the blow-up equations for dual Nekrasov partition function of 4d pure supersymmetric gauge theory, which can be even treated as a defining system of equations for both $c=1$ and $c\to\infty$ conformal blocks. We extend this analysis to the domain of strong-coupling regime where original definition of conformal blocks and Nekrasov functions is not known and apply the results to spectral problem of the Matheiu equations. Finally, we propose a construction of irregular conformal blocks in the strong coupling region by quantization of Painlevé III$_3$ equation, and obtain in this way a general expression, reproducing $c=1$ and quasiclassical $c\to\infty$ results as its particular cases. We have also found explicit integral representations for $c=1$ and $c=-2$ irregular blocks at infinity for some special points.

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