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arXiv 2407.20104math.APmath.PR
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有界域中随机强迫欧拉-泊松方程的稳态解:第二部分. 一维欧姆接触边界

Stationary solution to Stochastically Forced Euler-Poisson Equations in Bounded Domain: Part 2. 1-D Ohmic Contact Boundary

Yachun Li, Ming Mei, Lizhen Zhang

AI总结:

本文针对带欧姆接触边界的一维随机欧拉-泊松方程,利用Banach不动点定理和加权能量估计证明稳态附近解的全局存在性与渐近稳定性,并证明不变测度为稳态对应的Dirac测度。

摘要:

本文研究由维纳过程驱动、带欧姆接触边界条件的一维随机欧拉-泊松方程稳态解的渐近稳定性。我们利用Banach不动点定理和关于时间一致先验能量估计,保证稳态附近解的全局存在性。与确定性情形不同,随机力的存在导致动量缺少时间导数,给能量估计带来困难。此外,与绝缘边界条件系统相比,欧姆接触边界条件对能量估计构成更大挑战。为解决这一问题,我们通过对随机积分估计采用加权能量估计,建立了关于空间导数的渐近稳定性,所用技巧不同于确定性情形。进一步,基于先验能量估计,我们证明了不变测度的存在性。由于稳态附近扰动解呈指数衰减,该不变测度恰好对应于稳态生成的Dirac测度。

英文摘要:

In this paper, we establish the asymptotic stability of the steady-state for a 1-D stochastic Euler-Poisson equations with Ohmic contact boundary conditions forced by the Wiener process. We utilize Banach's fixed point theorem and the a priori energy estimates uniformly in time to ensure the global existence of solutions around the steady state. In contrast to the deterministic case, the presence of stochastic forces lead to the lack of temporal derivatives of momentum, posing challenges for energy estimates. Furthermore, Ohmic contact boundary conditions pose greater challenges for energy estimates compared to systems with insulating boundary conditions. To address this issue, we establish asymptotic stability concerning the spatial derivatives through weighted energy estimates for the estimates of stochastic integrals, employing a technique distinct from that of the deterministic case. Furthermore, we demonstrate the existence of an invariant measure based on the a priori energy estimates. This invariant measure precisely corresponds to the Dirac measure generated by the steady state, due to the exponential decay of perturbed solutions around the steady state.

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