Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dynamics of bacterial flow: Emergence of spatiotemporal coherent
  structures   We propose a simple model of self-propelled particles to show that coherent
structures, such as jets and swirls, can arise from a plausible microscopic
mechanisms: (i) the elongated shape of the self-propelled particles with (ii)
the hardcore interactions among them. We demonstrate via computer simulation
that these coherent structures, which emerge at sufficiently high densities of
particles, have characteristics that are similar to those observed in recent
experiments in bacteria baths.

20
The categories of this paper are: acc-phys
26
The categories of this paper are: bayes-an
31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex
7
The categories of this paper are: hep-th
2
The categories of this paper are: math
11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin
13
The categories of this paper are: quant-ph
18
The categories of this paper are: econ
5
The categories of this paper are: gr-qc
28
The categories of this paper are: alg-geom
27
The categories of this paper are: comp-gas
30
The categories of this paper are: q-alg
32
The categories of this paper are: atom-ph
33
The categories of this paper are: plasm-ph