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arXiv 2103.05932math.APmath-phmath.MP
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具有聚焦非线性演化的绝热近似的一般框架

A generic framework of adiabatic approximation for evolutions with focusing nonlinearity

Jingxuan Zhang

摘要:

在发展方程的研究中,绝热近似方法是将无限维动力系统简化为有限维系统的重要工具。在本文中,我们制定了一个通用的绝热近似方案,是有效的一个抽象的非线性演化温和的正则性假设下。该方案的关键前提是我们称之为近似孤子的存在。这些是一些低能量但不一定是静止的构型。近似孤子的特征在于由许多参数(可能是无穷多个),并具有流形结构。绝热格式将给定的抽象发展方程简化为近似孤子流形上的有效方程。我们给出了近似孤子的充分条件,使约化方案在大的时间范围内是有效的。这种方法的有效性取决于初始演化的能量性质和近似孤子的绝热性。

英文摘要:

In the study of evolution equations, the method of adiabatic approximation is an essential tool to reduce an infinite-dimensional dynamical system to a simpler, possibly finite-dimensional one. In this paper, we formulate a generic scheme of adiabatic approximation that is valid for an abstract nonlinear evolution under mild regularity assumptions. The key prerequisite for the scheme is the existence of what we call approximate solitons. These are some low energy but not necessarily stationary configurations. The approximate solitons are characterized by a number of parameters (possibly infinitely many), and have a manifold structure. The adiabatic scheme reduces the given abstract evolution equation to an effective equation on the manifold of approximate solitons. We give sufficient conditions for the approximate solitons so that the reduction scheme is valid up to a large time. The validity is determined by the energy property of the original evolution as well as the adiabaticity of the approximate solitons.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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