Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A lattice model for active--passive pedestrian dynamics: a quest for
  drafting effects   We study the pedestrian escape from an obscure corridor using a lattice gas
model with two species of particles. One species, called passive, performs a
symmetric random walk on the lattice, whereas the second species, called
active, is subject to a drift guiding the particles towards the exit. The drift
mimics the awareness of some pedestrians of the geometry of the corridor and of
the location of the exit. We provide numerical evidence that, in spite of the
hard core interaction between particles -- namely, there can be at most one
particle of any species per site, -- adding a fraction of active particles in
the system enhances the evacuation rate of all particles from the corridor. A
similar effect is also observed when looking at the outgoing particle flux,
when the system is in contact with an external particle reservoir that induces
the onset of a steady state. We interpret this phenomenon as a discrete space
counterpart of the drafting effect typically observed in a continuum set--up as
the aerodynamic drag experienced by pelotons of competing cyclists.

11
The categories of this paper are: hep-lat
24
The categories of this paper are: dg-ga
37
The categories of this paper are: supr-con
26
The categories of this paper are: bayes-an
36
The categories of this paper are: cmp-lg
34
The categories of this paper are: chem-ph
10
The categories of this paper are: q-bio
32
The categories of this paper are: atom-ph
31
The categories of this paper are: ao-sci
12
The categories of this paper are: nucl-th
1
The categories of this paper are: cs
2
The categories of this paper are: math
23
The categories of this paper are: solv-int
14
The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc
9
The categories of this paper are: nlin