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arXiv 2401.02240math.APmath.PR
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Wasserstein受控梯度流的Hamilton--Jacobi方程:粘性解的存在性

Hamilton--Jacobi equations for Wasserstein controlled gradient flows: existence of viscosity solutions

Giovanni Conforti, Richard C. Kraaij, Luca Tamanini, Daniela Tonon

AI总结:

作为系列研究第三部分,本文在满足McCann条件的Wasserstein梯度流框架下,引入受控EVI,证明线性受控梯度流问题的值函数是对应Hamilton-Jacobi方程的粘性解,完善了度量空间中相关方程的内蕴几何适定性理论。

摘要:

本工作是arXiv:2111.13258、arXiv:2302.06571中启动的研究计划的第三部分,该计划旨在为度量空间中与受控梯度流问题相关的Hamilton-Jacobi方程建立内蕴几何适定性理论。本文在底层能量泛函满足McCann条件的Wasserstein梯度流框架下完成了分析。更确切地说,我们证明了一类线性受控梯度流问题的值函数是对应Hamilton-Jacobi方程的粘性解:该问题的运行成本关于控制变量是二次的,关于状态变量仅连续;粘性解的定义基于我们前期工作中提出的两个算子,它们可作为所研究形式化哈密顿量的严格上下界。这些算子的定义直接受梯度流的演化变分不等式(EVI)形式启发:本工作的主要创新之一是引入了受控版本的EVI,它在建立定义候选解的受控梯度流问题中优化序列的正则性、能量界和度量界方面起到了关键作用。

英文摘要:

This work is the third part of a program initiated in arXiv:2111.13258, arXiv:2302.06571 aiming at the development of an intrinsic geometric well-posedness theory for Hamilton-Jacobi equations related to controlled gradient flow problems in metric spaces. In this paper, we finish our analysis in the context of Wasserstein gradient flows with underlying energy functional satisfying McCann's condition. More prescisely, we establish that the value function for a linearly controlled gradient flow problem whose running cost is quadratic in the control variable and just continuous in the state variable yields a viscosity solution to the Hamilton-Jacobi equation in terms of two operators introduced in our former works, acting as rigorous upper and lower bounds for the formal Hamiltonian at hand. The definition of these operators is directly inspired by the Evolutional Variational Inequality formulation of gradient flows (EVI): one of the main innovations of this work is to introduce a controlled version of EVI, which turns out to be crucial in establishing regularity properties, energy and metric bounds along optimzing sequences in the controlled gradient flow problem that defines the candidate solution.

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