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1Global weak solutions to Landau-Lifshitz equations into compact Lie algebras显示文摘We consider a parabolic system from a bounded domain in a Euclidean space or a closed Riernannian manifold into a unit sphere in a compact Lie algebra g,which can be viewed as the extension of Landau-Lifshitz(LL)equation and was proposed by V.Arnold.We follow the ideas taken from the work by the second author to show the existence of global weak solutions to the Cauchy problems of such LL equations from an n-dimensional closed Riernannian manifold T or a bounded domain in R^n into a unit sphere Sg(1)in g.In particular,we consider the Hamiltonian system associated with the non­local energy micromagnetic energy defined on a bounded domain of R^31 and show the initial-boundary value problem to such LL equation without damping terms admits a global weak solution.The key ingredient of this article consists of the choices of test functions and approximate equations.Zonglin JIA Youde WANG 2019Frontiers of Mathematics in China2019,14,6:1
2具有外磁场的Landau-Lifshitz方程显示文摘本文研究具有外磁场的Landau-Lifshitz方程的全局动力学,具体包括局部适定性、全局适定性、周期解的存在性.首先,利用移动标架法将Landau-Lifshitz方程转化为半线性Schrodinger方程,从而利用色散方程的技巧得到任意维的局部适定性和一维的全局适定性.其次,通过使用Landau-Lifshitz方程的对称性将周期解的存在性转化为常微分方程,从而证明了具有非零常值外磁场的Landau-Lifshitz方程具有非平凡的周期解,同时对于时间相关的外磁场,我们构造了若干具有典型动力学意义的特解.陈旭 苏金 黎泽 2023应用数学2023,36,2:0
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