Instruct: Identify the main and secondary category of Arxiv papers based on the titles
Query: Electronic lifetimes in ballistic quantum dots electrostatically coupled
  to metallic environments
30
The categories of this paper are: q-alg
3
The categories of this paper are: physics
2
The categories of this paper are: math
7
The categories of this paper are: hep-th
10
The categories of this paper are: q-bio
6
The categories of this paper are: astro-ph
15
The categories of this paper are: nucl-ex
34
The categories of this paper are: chem-ph
20
The categories of this paper are: acc-phys
0
The categories of this paper are: hep-ph
31
The categories of this paper are: ao-sci
1
The categories of this paper are: cs
27
The categories of this paper are: comp-gas
26
The categories of this paper are: bayes-an
36
The categories of this paper are: cmp-lg
18
The categories of this paper are: econ