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arXiv 2007.06447math.DGmath.PRmath.SP
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Hodge Laplacian的散射理论

Scattering theory for the Hodge Laplacian

Robert Baumgarth

摘要:

利用积分准则证明了完全开光滑流形$M$上由两个拟等距黎曼度量$g$和$h$诱导的$ν\in\{g,h\}$作用于微分$k$ -形式的Hodge Laplacian算子$Δ_ν^{(k)}$对应的波算子$W_{\pm}(Δ_h^{(k)}, Δ_g^{(k)}, I_{g,h}^{(k)})$的存在性和完备性.特别地,该结果提供了$Δ_ν^{(k)}$的绝对连续光谱$σ_{\mathrm{ac}}(Δ_g^{(k)}) = σ_{\mathrm{ac}}(Δ_h^{(k)})$重合的标准。证明的基础上得到的概率Bismut型公式的热半群谱演算定义的梯度估计。通过这些局部化的公式,积分准则需要局部曲率界和一些上局部控制的热核作用于功能提供的Weitzenböck曲率自同态是在加藤类,但没有控制的内射半径。一个结果是绝对连续谱在Ricci流下的稳定性结果。作为应用,我们集中在保形扰动的重要情况。

英文摘要:

We prove using an integral criterion the existence and completeness of the wave operators $W_{\pm}(Δ_h^{(k)}, Δ_g^{(k)}, I_{g,h}^{(k)})$ corresponding to the Hodge Laplacians $Δ_ν^{(k)}$ acting on differential $k$-forms, for $ν\in\{g,h\}$, induced by two quasi-isometric Riemannian metrics $g$ and $h$ on a complete open smooth manifold $M$. In particular, this result provides a criterion for the absolutely continuous spectra $σ_{\mathrm{ac}}(Δ_g^{(k)}) = σ_{\mathrm{ac}}(Δ_h^{(k)})$ of $Δ_ν^{(k)}$ to coincide. The proof is based on gradient estimates obtained by probabilistic Bismut-type formulae for the heat semigroup defined by spectral calculus. By these localised formulae, the integral criterion requires local curvature bounds and some upper local control on the heat kernel acting on functions provided the Weitzenböck curvature endomorphism is in the Kato class, but no control on the injectivity radii. A consequence is a stability result of the absolutely continuous spectrum under a Ricci flow. As an application we concentrate on the important case of conformal perturbations.

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