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arXiv 1702.03552math.AP
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非正曲率曲面中曲线上本征函数的积分

Integrals of eigenfunctions over curves in surfaces of nonpositive curvature

Emmett L. Wyman

摘要:

设$(M,g)$是具有非正截面曲率的紧致二维黎曼流形.令$Δ_g$是对应于$M$上的度量$g$的Laplace-Beltrami算子,并且令$e_λ$是具有本征值$λ$的$Δ_g$的$L^2$归一化本征函数,即\[ -Δ_g e_λ= λ^2 e_λ. \]我们证明了\[ \left| \int_{\mathbb R} b(t) e_λ(γ(t)) \, dt \right| = o(1) \quad \text{ as } λ\to \infty \],其中$b$是光滑的,$\mathbb R$和$γ$上的composite支持函数是一条由弧参数化的曲线,长度,其测地曲率$κ(γ(t))$避免每个$t \in \operatorname{supp} b$的两个临界曲率$\mathbf k(γ'^\perp(t))$和$\mathbf k(-γ'^{\perp}(t))$。$\mathbf k(v)$表示在$-v$方向上沿着测地线射线取到无穷远的圆心的圆的曲率。

英文摘要:

Let $(M,g)$ be a compact, 2-dimensional Riemannian manifold with nonpositive sectional curvature. Let $Δ_g$ be the Laplace-Beltrami operator corresponding to the metric $g$ on $M$, and let $e_λ$ be $L^2$-normalized eigenfunctions of $Δ_g$ with eigenvalue $λ$, i.e. \[ -Δ_g e_λ= λ^2 e_λ. \] We prove \[ \left| \int_{\mathbb R} b(t) e_λ(γ(t)) \, dt \right| = o(1) \quad \text{ as } λ\to \infty \] where $b$ is a smooth, compactly supported function on $\mathbb R$ and $γ$ is a curve parametrized by arc-length whose geodesic curvature $κ(γ(t))$ avoids two critical curvatures $\mathbf k(γ'^\perp(t))$ and $\mathbf k(-γ'^{\perp}(t))$ for each $t \in \operatorname{supp} b$. $\mathbf k(v)$ denotes the curvature of a circle with center taken to infinity along the geodesic ray in direction $-v$.

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