Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Contractile and chiral activities co-determine the helicity of swimming
  droplet trajectories   Active fluids are a class of non-equilibrium systems where energy is injected
into the system continuously by the constituent particles themselves. Many
examples, such as bacterial suspensions and actomyosin networks, are
intrinsically chiral at a local scale, so that their activity involves torque
dipoles alongside the force dipoles usually considered. Although many aspects
of active fluids have been studied, the effects of chirality on them are much
less known. Here we study by computer simulation the dynamics of an
unstructured droplet of chiral active fluid in three dimensions. Our model only
considers the simplest possible combination of chiral and achiral active
stresses, yet this leads to an unprecedented range of complex motilities,
including oscillatory swimming, helical swimming, and run-and-tumble motion.
Strikingly, while the chirality of helical swimming is the same as the
microscopic chirality of torque dipoles in one regime, the two are opposite in
another. Some of the features of these motility modes resemble those of some
single-celled protozoa, suggesting that underlying mechanisms may be shared by
some biological systems and synthetic active droplets.

16
The categories of this paper are: stat
36
The categories of this paper are: cmp-lg
22
The categories of this paper are: chao-dyn
34
The categories of this paper are: chem-ph
37
The categories of this paper are: supr-con
28
The categories of this paper are: alg-geom
26
The categories of this paper are: bayes-an
19
The categories of this paper are: eess
10
The categories of this paper are: q-bio
13
The categories of this paper are: quant-ph
25
The categories of this paper are: patt-sol
32
The categories of this paper are: atom-ph
35
The categories of this paper are: mtrl-th
1
The categories of this paper are: cs
8
The categories of this paper are: hep-ex
33
The categories of this paper are: plasm-ph