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arXiv 1002.2480math-phhep-thmath.MP
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2D伊辛模型和Painlevé VI中的形状因子扩展

Form factor expansions in the 2D Ising model and Painlevé VI

Vladimir V. Mangazeev, Anthony J. Guttmann

摘要:

我们推导出一个户田型递归关系,在高温和低温制度,$λ$ -扩展的对角关联函数$C(N,N;λ)$的二维伊辛模型,使用对角形状因子扩展和tau函数Painlevé VI(PVI)理论,最初发现的Jimbo和Miwa之间的早期连接。这大大简化了对角关联函数的计算,特别是它们的$λ$扩展对应函数。我们还推测一个封闭的形式表达的最简单的非对角情况下$C^{\pm}(0,1;λ)$连接PVI理论是未知的。结合对角相关的结果,给出了McCoy,Perk和Wu发现的关联函数的二次差分方程的$ł$扩展形式所需的所有初始条件。这里得到的结果应该提供一个进一步的潜在的算法改进的$ł$扩展的情况下,并促进其他的发展。

英文摘要:

We derive a Toda-type recurrence relation, in both high and low temperature regimes, for the $λ$ - extended diagonal correlation functions $C(N,N;λ)$ of the two-dimensional Ising model, using an earlier connection between diagonal form factor expansions and tau-functions within Painlevé VI (PVI) theory, originally discovered by Jimbo and Miwa. This greatly simplifies the calculation of the diagonal correlation functions, particularly their $λ$-extended counterparts. We also conjecture a closed form expression for the simplest off-diagonal case $C^{\pm}(0,1;λ)$ where a connection to PVI theory is not known. Combined with the results for diagonal correlations these give all the initial conditions required for the $ł$-extended version of quadratic difference equations for the correlation functions discovered by McCoy, Perk and Wu. The results obtained here should provide a further potential algorithmic improvement in the $ł$-extended case, and facilitate other developments.

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