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arXiv 1108.3191math.APmath-phmath.MPmath.PRmath.SP
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流形上的布朗旅行者

The Brownian traveller on manifolds

Martin Kolb, David Krejcirik

摘要:

研究了二维黎曼流形中无界测地线的管状邻域内的热方程的内禀曲率对大时间行为的影响。由于我们考虑了killing边界条件,热半群总是存在指数型衰减。我们表明,这种指数型衰减是缓慢的积极弯曲的流形相比,平坦的情况下。作为主要结果,我们建立了负曲流形上热半群相对于平坦流形上热半群的一个尖锐的额外多项式型衰减。证明中利用了负曲流形上管状邻域中Dirichlet Laplacian的Hardy型不等式的存在性,以及热方程的自相似变量和加权索伯列夫空间的方法.

英文摘要:

We study the influence of the intrinsic curvature on the large time behaviour of the heat equation in a tubular neighbourhood of an unbounded geodesic in a two-dimensional Riemannian manifold. Since we consider killing boundary conditions, there is always an exponential-type decay for the heat semigroup. We show that this exponential-type decay is slower for positively curved manifolds comparing to the flat case. As the main result, we establish a sharp extra polynomial-type decay for the heat semigroup on negatively curved manifolds comparing to the flat case. The proof employs the existence of Hardy-type inequalities for the Dirichlet Laplacian in the tubular neighbourhoods on negatively curved manifolds and the method of self-similar variables and weighted Sobolev spaces for the heat equation.

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