Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Perturbative estimates on the transport cross section in quantum
  scattering by hard obstacles   The quantum scattering by smooth bodies is considered for small and large
values of $kd$, with $k$ the wavenumber and $d$ the scale of the body. In both
regimes, we prove that the forward scattering exceeds the backscattering. For
high $k$, we need to assume that the body is strictly convex.

15
The categories of this paper are: nucl-ex
9
The categories of this paper are: nlin
1
The categories of this paper are: cs
32
The categories of this paper are: atom-ph
13
The categories of this paper are: quant-ph
29
The categories of this paper are: funct-an
37
The categories of this paper are: supr-con
0
The categories of this paper are: hep-ph
6
The categories of this paper are: astro-ph
23
The categories of this paper are: solv-int
26
The categories of this paper are: bayes-an
27
The categories of this paper are: comp-gas
3
The categories of this paper are: physics
16
The categories of this paper are: stat
28
The categories of this paper are: alg-geom
7
The categories of this paper are: hep-th