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arXiv 0802.1970hep-th
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求解精确重整化群方程的解析逼近格式。II共形映射

Analytical approximation schemes for solving exact renormalization group equations. II Conformal mappings

C. Bervillier, B. Boisseau, H. Giacomini

摘要:

针对精确重整化群方程的导数展开式的研究,提出了一种新的求解常微分方程两点边值问题的有效解析逼近格式.它是基于一个紧凑化的复平面的独立变量使用映射的角度扇区到一个单位盘。我们明确地对待,为标量场,局部势近似的Wegner-Houghton方程的尺寸$d=3$和威尔逊-Polchinski方程的某些值的$d\in ] 2,3] $。然后,我们考虑,为$d=3$,耦合的常微分方程得到的莫里斯在二阶导数展开。在这两种情况下的不动点和特征值连接到他们估计。所获得的结果进行了比较与射击方法和与其他可用的分析方法。我们的新方法达到了最佳精度,它也具有非常快的优点。因此,它非常适合于研究更复杂的方程组。

英文摘要:

We present a new efficient analytical approximation scheme to two-point boundary value problems of ordinary differential equations (ODEs) adapted to the study of the derivative expansion of the exact renormalization group equations. It is based on a compactification of the complex plane of the independent variable using a mapping of an angular sector onto a unit disc. We explicitly treat, for the scalar field, the local potential approximations of the Wegner-Houghton equation in the dimension $d=3$ and of the Wilson-Polchinski equation for some values of $d\in ] 2,3] $. We then consider, for $d=3$, the coupled ODEs obtained by Morris at the second order of the derivative expansion. In both cases the fixed points and the eigenvalues attached to them are estimated. Comparisons of the results obtained are made with the shooting method and with the other analytical methods available. The best accuracy is reached with our new method which presents also the advantage of being very fast. Thus, it is well adapted to the study of more complicated systems of equations.

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