Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Unzipping of DNA under the influence of external fields   We study the features on the unzipping process of a modified version of the
Peyrard-Bishop- Dauxois model. We show that the inclusion of a barrier in the
on-site potential allows for the existence of stable domain wall solutions
between open and closed regions of the DNA chain. We analyze the linear
stability of such solutions and study their relevance in the dynamical behavior
of DNA under ac forces.

32
The categories of this paper are: atom-ph
35
The categories of this paper are: mtrl-th
30
The categories of this paper are: q-alg
12
The categories of this paper are: nucl-th
9
The categories of this paper are: nlin
19
The categories of this paper are: eess
8
The categories of this paper are: hep-ex
7
The categories of this paper are: hep-th
1
The categories of this paper are: cs
28
The categories of this paper are: alg-geom
2
The categories of this paper are: math
33
The categories of this paper are: plasm-ph
15
The categories of this paper are: nucl-ex
18
The categories of this paper are: econ
6
The categories of this paper are: astro-ph
20
The categories of this paper are: acc-phys