Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Three-body Interactions Drive the Transition to Polar Order in a Simple
  Flocking Model   A large class of mesoscopic or macroscopic flocking theories are
coarse-grained from microscopic models that feature binary interactions as the
chief aligning mechanism. However while such theories seemingly predict the
existence of polar order with just binary interactions, actomyosin motility
assay experiments show that binary interactions are insufficient to obtain
polar order, especially at high densities. To resolve this paradox, here we
introduce a solvable one-dimensional flocking model and derive its stochastic
hydrodynamics. We show that two-body interactions are insufficient to generate
polar order unless the noise is non-Gaussian. We show that noisy three-body
interactions in the microscopic theory allow us to capture all essential
dynamical features of the flocking transition, in systems that achieve
orientational order above a critical density.

3
The categories of this paper are: physics
21
The categories of this paper are: adap-org
9
The categories of this paper are: nlin
37
The categories of this paper are: supr-con
5
The categories of this paper are: gr-qc
33
The categories of this paper are: plasm-ph
25
The categories of this paper are: patt-sol
35
The categories of this paper are: mtrl-th
23
The categories of this paper are: solv-int
13
The categories of this paper are: quant-ph
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The categories of this paper are: hep-th
29
The categories of this paper are: funct-an
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The categories of this paper are: astro-ph
34
The categories of this paper are: chem-ph
0
The categories of this paper are: hep-ph
8
The categories of this paper are: hep-ex