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arXiv math-ph/0506047math-phmath.MP
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3d Hamilton系统的耗散扰动

Dissipative Perturbations of 3d Hamiltonian Systems

Daniel Fish

摘要:

本文给出了三维Hamilton系统自然耗散扰动的一些结果。给定一个哈密顿系统dx/dt = PdH,和一个Casimir函数S,我们构造一个对称协变张量g,使得修改的(所谓的“metriplectic”)系统dx/dt = PdH + gdS满足以下条件:dH是g的零向量,并且dS(gdS)< 0。沿着这种类型的动力系统的解,哈密顿函数H保持不变,而函数S减小,即S被系统耗散。我们的动机是由P. J. Morrison的松弛刚体的例子,其中引入了这种类型的系统。

英文摘要:

In this article we present some results concerning natural dissipative perturbations of 3d Hamiltonian systems. Given a Hamiltonian system dx/dt = PdH, and a Casimir function S, we construct a symmetric covariant tensor g, so that the modified (so-called 'metriplectic') system dx/dt = PdH + gdS satisfies the following conditions: dH is a null vector for g, and dS(gdS)< 0. Along solutions to a dynamical system of this type, the Hamiltonian function H is preserved while the function S decreases, i.e. S is dissipated by the system. We are motivated by the example of a relaxing rigid body by P.J. Morrison in which systems of this type were introduced.

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