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arXiv 1001.2121math.APmath.GT
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平面上光滑非奇异向量场在函数空间中的整体可解性

Global Solvability in Functional Spaces for Smooth Nonsingular Vector Fields in the Plane

Roberto De Leo, Todor Gramchev, Alexandre Kirilov

摘要:

我们解决了与几何和动力系统中的上同调方程$Lu=f$相关的平面上光滑非奇异向量场$L$类的一些全局可解性问题。第一个主要结果是$L$在$C^\infty(\R^2)$中不是满射的当且仅当几何条件--分界线带的存在性成立。其次,对于非满射向量场,我们证明了如果RHS $f$在分界线上至多有指数增长性,我们可以在分界线的边界附近找到全局弱解$L^1_{loc}$。最后,我们研究了零阶p.d.o.扰动的整体可解性。我们提供的例子表明,我们的估计是尖锐的。

英文摘要:

We address some global solvability issues for classes of smooth nonsingular vector fields $L$ in the plane related to cohomological equations $Lu=f$ in geometry and dynamical systems. The first main result is that $L$ is not surjective in $C^\infty(\R^2)$ iff the geometrical condition -- the existence of separatrix strips -- holds. Next, for nonsurjective vector fields, we demonstrate that if the RHS $f$ has at most infra-exponential growth in the separatrix strips we can find a global weak solution $L^1_{loc}$ near the boundaries of the separatrix strips. Finally we investigate the global solvability for perturbations with zero order p.d.o. We provide examples showing that our estimates are sharp.

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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