Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Asynchrony promotes polarized collective motion in attraction based
  models   Animal groups frequently move in a highly organized manner, as represented by
flocks of birds and schools of fish. Despite being an everyday occurrence, we
do not yet fully understand how this works. What type of social interactions
between animals gives rise to the overall flock structure and behavior we
observe? This question is often investigated using self-propelled particle
models where particles represent the individual animals. These models differ in
the social interactions used, individual particle properties, and various
technical assumptions. One particular technical assumption relates to whether
all particles update their headings and positions at exactly the same time
(synchronous update) or not (asynchronous update). Here we investigate the
causal effects of this assumption in a specific model and find that it has a
dramatic impact. In particular, polarized groups do not form when synchronous
update is used, but are always produced with asynchronous updates. We also show
that full asynchrony is not required for polarized groups to form and quantify
time to polarized group formation. Since many important models in the
literature have been implemented with synchronous update only, we speculate
that our understanding of these models, or rather the social interactions on
which they are based, may be incomplete. Perhaps a range of previously
unobserved dynamic phenomena will emerge if other potentially more realistic
update schemes are chosen.

20
The categories of this paper are: acc-phys
2
The categories of this paper are: math
6
The categories of this paper are: astro-ph
35
The categories of this paper are: mtrl-th
37
The categories of this paper are: supr-con
16
The categories of this paper are: stat
30
The categories of this paper are: q-alg
11
The categories of this paper are: hep-lat
21
The categories of this paper are: adap-org
27
The categories of this paper are: comp-gas
18
The categories of this paper are: econ
32
The categories of this paper are: atom-ph
29
The categories of this paper are: funct-an
26
The categories of this paper are: bayes-an
22
The categories of this paper are: chao-dyn
12
The categories of this paper are: nucl-th