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arXiv 1301.0950math-phmath.MPnlin.SI
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可积粘性守恒律

Integrable viscous conservation laws

Alessandro Arsie, Paolo Lorenzoni, Antonio Moro

摘要:

本文将Dubrovin-Zhang微扰方法推广到非Hamilton可积标量守恒律规范形的研究中。前几个修正的显式计算导致的猜想,这样的规范形式参数化的一个单一的功能参数,命名为粘性中心不变。一个常值粘性中心不变量对应于著名的Burgers层次。线性粘性中心不变量的情况提供了Camassa-Holm方程的粘性模拟,该方程以前作为两分量Hamilton可积系统的简化出现。我们明确地写出了与这个方程相关联的负的和正的层次,并证明了它们的可积性,表明它们可以分别映射到热层次和它的负对应物,称为Klein-Gordon层次。还证明了周期初始数据的局部适定性定理。我们展示了如何传输方程可以用来有效地构造渐近解通过扩展的准三浦映射,保持初始数据。该方法是替代方法的弦方程的哈密顿守恒律,自然延伸到粘性的情况下。使用这些工具,我们推导出粘性模拟的Painlevé I2方程,描述了普遍的行为的解决方案在临界点的梯度突变。

英文摘要:

We propose an extension of the Dubrovin-Zhang perturbative approach to the study of normal forms for non-Hamiltonian integrable scalar conservation laws. The explicit computation of the first few corrections leads to the conjecture that such normal forms are parameterized by one single functional parameter, named viscous central invariant. A constant valued viscous central invariant corresponds to the well-known Burgers hierarchy. The case of a linear viscous central invariant provides a viscous analog of the Camassa-Holm equation, that formerly appeared as a reduction of a two-component Hamiltonian integrable systems. We write explicitly the negative and positive hierarchy associated with this equation and prove the integrability showing that they can be mapped respectively into the heat hierarchy and its negative counterpart, named the Klein-Gordon hierarchy. A local well-posedness theorem for periodic initial data is also proven. We show how transport equations can be used to effectively construct asymptotic solutions via an extension of the quasi-Miura map that preserves the initial datum. The method is alternative to the method of the string equation for Hamiltonian conservation laws and naturally extends to the viscous case. Using these tools we derive the viscous analog of the Painlevé I2 equation that describes the universal behaviour of the solution at the critical point of gradient catastrophe.

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