Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Role of cohesion in the formation of kink wave fronts in vibrofluidized
  granular materials   The formation of kink wave fronts (KWFs) in a quasi-two-dimensional granular
system is investigated numerically with a focus on the role of cohesive
interactions between individual particles. The cohesive particle-particle
interaction is achieved through tuning the velocity-dependent coefficient of
restitution, based on an analytical model introduced recently. A comparison
with experimental results indicates that the threshold for the emergence of
traveling KWFs matches the regime in which the center of mass height of the
granular layers fluctuates with a period that triples the vibration period.
Further comparisons between dry and wet granular dynamics reveal that KWFs are
more pronounced in wet granular layers because of enhanced collective motion
induced by cohesion.

2
The categories of this paper are: math
7
The categories of this paper are: hep-th
28
The categories of this paper are: alg-geom
6
The categories of this paper are: astro-ph
30
The categories of this paper are: q-alg
5
The categories of this paper are: gr-qc
22
The categories of this paper are: chao-dyn
16
The categories of this paper are: stat
21
The categories of this paper are: adap-org
31
The categories of this paper are: ao-sci
11
The categories of this paper are: hep-lat
27
The categories of this paper are: comp-gas
23
The categories of this paper are: solv-int
13
The categories of this paper are: quant-ph
25
The categories of this paper are: patt-sol
24
The categories of this paper are: dg-ga