Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Integrals of eigenfunctions over curves in surfaces of nonpositive
  curvature   Let $(M,g)$ be a compact, 2-dimensional Riemannian manifold with nonpositive
sectional curvature. Let $\Delta_g$ be the Laplace-Beltrami operator
corresponding to the metric $g$ on $M$, and let $e_\lambda$ be $L^2$-normalized
eigenfunctions of $\Delta_g$ with eigenvalue $\lambda$, i.e. \[ -\Delta_g
e_\lambda = \lambda^2 e_\lambda. \] We prove \[ \left| \int_{\mathbb R} b(t)
e_\lambda (\gamma(t)) \, dt \right| = o(1) \quad \text{ as } \lambda \to \infty
\] where $b$ is a smooth, compactly supported function on $\mathbb R$ and
$\gamma$ is a curve parametrized by arc-length whose geodesic curvature
$\kappa(\gamma(t))$ avoids two critical curvatures $\mathbf
k(\gamma'^\perp(t))$ and $\mathbf k(-\gamma'^{\perp}(t))$ 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 $-v$.

35
The categories of this paper are: mtrl-th
30
The categories of this paper are: q-alg
21
The categories of this paper are: adap-org
6
The categories of this paper are: astro-ph
27
The categories of this paper are: comp-gas
31
The categories of this paper are: ao-sci
37
The categories of this paper are: supr-con
13
The categories of this paper are: quant-ph
9
The categories of this paper are: nlin
16
The categories of this paper are: stat
5
The categories of this paper are: gr-qc
18
The categories of this paper are: econ
26
The categories of this paper are: bayes-an
17
The categories of this paper are: q-fin
33
The categories of this paper are: plasm-ph
10
The categories of this paper are: q-bio