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arXiv 1407.0630math.DGmath-phmath.FAmath.MP
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共形扰动下Hodge-Laplacian的散射理论

Scattering theory of the Hodge-Laplacian under a conformal perturbation

Francesco Bei, Batu Güneysu, Jörn Müller

摘要:

设$g$和$\tilde{g}$是非紧流形$M$上的黎曼度量,它们共形等价.我们表明,在一个非常温和的\emph{first order}控制下的共形因子,相应的Hodge-Laplacian $Δ_g$和$Δ_{\tilde{g}}$作用于微分形式的波算子存在,是完整的。我们将这个结果应用到具有有界几何的黎曼流形,更具体地说,应用到具有有界几何的翘曲积黎曼流形。最后,我们结合我们的结果与一些明确的计算Antoci,以确定绝对连续谱的Hodge-Laplacian的$j$ -形式的一大类的翘曲产品度量。

英文摘要:

Let $g$ and $\tilde{g}$ be Riemannian metrics on a noncompact manifold $M$, which are conformally equivalent. We show that under a very mild \emph{first order} control on the conformal factor, the wave operators corresponding to the Hodge-Laplacians $Δ_g$ and $Δ_{\tilde{g}}$ acting on differential forms exist and are complete. We apply this result to Riemannian manifolds with a bounded geometry and more specifically, to warped product Riemannian manifolds with a bounded geometry. Finally, we combine our results with some explicit calculations by Antoci to determine the absolutely continuous spectrum of the Hodge-Laplacian on $j$-forms for a large class of warped product metrics.

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