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arXiv 2410.02436math.APmath.PR
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无界域中Landau-Lifshitz-Bloch方程的不变测度及其极限行为

Invariant measures and their limiting behavior of the Landau-Lifshitz-Bloch equation in unbounded domains

Daiwen Huang, Zhaoyang Qiu, Bixiang Wang

AI总结:

本文研究无界域上带噪声的随机Landau-Lifshitz-Bloch方程的不变测度,通过区域扩张法证解的存在唯一性,用弱Feller论证得不变测度存在性,一维情形下证不变测度集一致胎紧且扰动方程不变测度的极限为极限系统的不变测度,发展了克服无界域困难的相关技术。

摘要:

本文研究定义在全空间$\u211d^d$($d=1,2$)上、由线性乘性噪声与加性噪声驱动的随机Landau-Lifshitz-Bloch方程的不变测度的存在性与极限行为,该方程用于描述铁磁材料中居里温度附近的相自旋。我们首先通过区域扩张方法建立了解的存在唯一性。随后利用弱Feller论证证明了不变测度的存在性。在$d=1$的情形下,我们证明了该随机方程所有不变测度构成的集合具有一致胎紧性,且扰动方程的不变测度序列的任意极限都必定是极限系统的不变测度。本文发展了截断论证、停时技术以及解的一致尾端估计,以克服无界域中高阶非线性与Sobolev嵌入的非紧性带来的困难。

英文摘要:

This paper deals with the existence and limiting behavior of invariant measures of the stochastic Landau-Lifshitz-Bloch equation driven by linear multiplicative noise and additive noise defined in the entire space $\mathbb{R}^d$ for $d=1,2$, which describes the phase spins in ferromagnetic materials around the Curie temperature. We first establish the existence and uniqueness of solutions by a domain expansion method. We then prove the existence of invariant measures by the weak Feller argument. In the case $d=1$, we show the uniform tightness of the set of all invariant measures of the stochastic equation, and prove any limit of a sequence of invariant measures of the perturbed equation must be an invariant measure of the limiting system. The cut-off arguments, stopping time techniques and uniform tail-ends estimates of solutions are developed to overcome the difficulty caused by the high-order nonlinearity and the non-compactness of Sobolev embeddings in unbounded domains.

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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