Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Novel type of phase transition in a system of self-driven particles   A simple model with a novel type of dynamics is introduced in order to
investigate the emergence of self-ordered motion in systems of particles with
biologically motivated interaction. In our model particles are driven with a
constant absolute velocity and at each time step assume the average direction
of motion of the particles in their neighborhood with some random perturbation
($\eta$) added. We present numerical evidence that this model results in a
kinetic phase transition from no transport (zero average velocity, $| {\bf v}_a
| =0$) to finite net transport through spontaneous symmetry breaking of the
rotational symmetry. The transition is continuous since $| {\bf v}_a |$ is
found to scale as $(\eta_c-\eta)^\beta$ with $\beta\simeq 0.45$.

5
The categories of this paper are: gr-qc
37
The categories of this paper are: supr-con
29
The categories of this paper are: funct-an
1
The categories of this paper are: cs
34
The categories of this paper are: chem-ph
18
The categories of this paper are: econ
15
The categories of this paper are: nucl-ex
8
The categories of this paper are: hep-ex
17
The categories of this paper are: q-fin
21
The categories of this paper are: adap-org
25
The categories of this paper are: patt-sol
31
The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph
23
The categories of this paper are: solv-int
28
The categories of this paper are: alg-geom
19
The categories of this paper are: eess