Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the Problems of Hazardous Matter and Radiation at Faster than Light
  Speeds in the Warp Drive Space-Time   The problems of hazardous radiation and collisions with matter on a warp
driven ship pose considerable obstacles to this possibility for interstellar
travel. A solution to these problems lies in the Broeck metric. It is
demonstrated that both threats to the ship will be greatly reduced. It is also
shown that the horizon problem no longer exists.

8
The categories of this paper are: hep-ex
26
The categories of this paper are: bayes-an
1
The categories of this paper are: cs
6
The categories of this paper are: astro-ph
17
The categories of this paper are: q-fin
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
4
The categories of this paper are: cond-mat
24
The categories of this paper are: dg-ga
27
The categories of this paper are: comp-gas
15
The categories of this paper are: nucl-ex
35
The categories of this paper are: mtrl-th
2
The categories of this paper are: math
14
The categories of this paper are: math-ph
13
The categories of this paper are: quant-ph
9
The categories of this paper are: nlin