Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Microorganism billiards in closed plane curves   Recent experiments have shown that many species of microorganisms leave a
solid surface at a fixed angle determined by steric interactions and near-field
hydrodynamics. This angle is completely independent of the incoming angle. For
several collisions in a closed body this determines a unique type of billiard
system, an aspecular billiard in which the outgoing angle is fixed for all
collisions. We analyze such a system using numerical simulation of this
billiard for varying tables and outgoing angles, and also utilize the theory of
one-dimensional maps and wavefront dynamics. When applicable we cite results
from and compare our system to similar billiard systems in the literature. We
focus on examples from three broad classes: the ellipse, the Bunimovich
billiards, and the Sinai billiards. The effect of a noisy outgoing angle is
also discussed.

0
The categories of this paper are: hep-ph
25
The categories of this paper are: patt-sol
34
The categories of this paper are: chem-ph
14
The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc
21
The categories of this paper are: adap-org
19
The categories of this paper are: eess
15
The categories of this paper are: nucl-ex
35
The categories of this paper are: mtrl-th
7
The categories of this paper are: hep-th
17
The categories of this paper are: q-fin
8
The categories of this paper are: hep-ex
29
The categories of this paper are: funct-an
6
The categories of this paper are: astro-ph
11
The categories of this paper are: hep-lat
22
The categories of this paper are: chao-dyn