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arXiv 1311.7166math-phmath.APmath.MPnlin.SI
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Hamilton偏微分方程组的临界性态

On critical behaviour in systems of Hamiltonian partial differential equations

B. Dubrovin, T. Grava, C. Klein, A. Moro

摘要:

本文研究了弱色散哈密顿系统解的临界行为,该系统被认为是具有两个分量的流体动力学型椭圆和双曲系统的扰动。我们认为,在无色散系统的梯度突变临界点附近,扰动方程的适当初值问题的解近似地由Painlevé-I(P $_I$)方程或其四阶类似物P $_I^2$的特解描述.作为具体例子,我们讨论了半经典极限下的非线性薛定谔方程。数值研究这些情况下提供了强有力的证据支持的猜想。

英文摘要:

We study the critical behaviour of solutions to weakly dispersive Hamiltonian systems considered as perturbations of elliptic and hyperbolic systems of hydrodynamic type with two components. We argue that near the critical point of gradient catastrophe of the dispersionless system, the solutions to a suitable initial value problem for the perturbed equations are approximately described by particular solutions to the Painlevé-I (P$_I$) equation or its fourth order analogue P$_I^2$. As concrete examples we discuss nonlinear Schrödinger equations in the semiclassical limit. A numerical study of these cases provides strong evidence in support of the conjecture.

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