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arXiv 2105.03401math.APmath.FA
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梯度流结构到非梯度流结构的伽玛收敛

Gamma-convergence of a gradient-flow structure to a non-gradient-flow structure

Mark A. Peletier, Mikola C. Schlottke

摘要:

我们研究了梯度系统的渐近行为的制度,其中的驱动能量变得奇异。对于这个系统,梯度系统收敛的概念是无效的。我们的限制行为的特点以不同的方式,通过证明$Γ$ -收敛的所谓的能量耗散功能,它结合了梯度系统组件的能量和耗散在一个单一的功能。这些泛函的$Γ$ -极限再次表征了变分演化,但这个极限泛函不是任何梯度系统的能量耗散泛函。所讨论的系统描述了在小噪声的限制下,粒子在一维双阱能量景观中的扩散。井具有不同的深度,并且在小噪声限制下,该过程收敛于两状态系统上的马尔可夫过程,其中仅发生从较高井到较低井的跳跃。这种从梯度系统到非梯度型变分演化的转变是一个模型,说明了有多少单向化学反应作为可逆反应的极限而出现。本文证明的$Γ$ -收敛既确定了这些反应的梯度系统的“命运”,也确定了极限不可逆反应的变分结构。

英文摘要:

We study the asymptotic behaviour of a gradient system in a regime in which the driving energy becomes singular. For this system gradient-system convergence concepts are ineffective. We characterize the limiting behaviour in a different way, by proving $Γ$-convergence of the so-called energy-dissipation functional, which combines the gradient-system components of energy and dissipation in a single functional. The $Γ$-limit of these functionals again characterizes a variational evolution, but this limit functional is not the energy-dissipation functional of any gradient system. The system in question describes the diffusion of a particle in a one-dimensional double-well energy landscape, in the limit of small noise. The wells have different depth, and in the small-noise limit the process converges to a Markov process on a two-state system, in which jumps only happen from the higher to the lower well. This transmutation of a gradient system into a variational evolution of non-gradient type is a model for how many one-directional chemical reactions emerge as limit of reversible ones. The $Γ$-convergence proved in this paper both identifies the `fate' of the gradient system for these reactions and the variational structure of the limiting irreversible reactions.

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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