A Hamilton-Jacobi PDE associated with hydrodynamic fluctuations from a nonlinear diffusion
A Hamilton-Jacobi PDE associated with hydrodynamic fluctuations from a nonlinear diffusion
复制标题
与非线性扩散引起的流体动力学波动相关的 Hamilton-Jacobi PDE
DOI:
10.1007/s00220-021-04110-1
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发表时间:
2021
期刊:
影响因子:
--
通讯作者:
Johannes Zimmer
中科院分区:
文献类型:
--
作者:
Jin Feng;Toshio Mikami;Johannes Zimmer
We study a class of Hamilton–Jacobi partial differential equations in the space of probability measures. In the first part of this paper, we prove comparison principles (implying uniqueness) for this class. In the second part, we establish the existence of a solution and give a representation using a family of partial differential equations with control. A large part of our analysis exploits special structures of the Hamiltonian, which might look mysterious at first sight. However, we show that this Hamiltonian structure arises naturally as limit of Hamiltonians of microscopical models. Indeed, in the third part of this paper, we informally derive the Hamiltonian studied before, in a context of fluctuation theory on the hydrodynamic scale. The analysis is carried out for a specific model of stochastic interacting particles in gas kinetics, namely a version of the Carleman model. We use a two-scale averaging method on Hamiltonians defined in the space of probability measures to derive the limiting Hamiltonian.