Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Channels for streaming instability in dusty discs   Streaming instability is a privileged channel to bridge the gap between
collisional growth of dust grains and planetesimal formation triggered by
gravity. This instability is thought to develop through its secular mode, which
is long-time growing and may not develop easily in real discs. We address this
point by revisiting its perturbation analysis. A third-order expansion with
respect to the Stokes number reveals important features over-looked so far. The
secular mode can be stable. Epicycles can be unstable, more resistant to
viscosity and are identified by Green's function analysis as promising channels
for planetesimals formation.

29
The categories of this paper are: funct-an
11
The categories of this paper are: hep-lat
35
The categories of this paper are: mtrl-th
19
The categories of this paper are: eess
36
The categories of this paper are: cmp-lg
4
The categories of this paper are: cond-mat
33
The categories of this paper are: plasm-ph
25
The categories of this paper are: patt-sol
31
The categories of this paper are: ao-sci
0
The categories of this paper are: hep-ph
37
The categories of this paper are: supr-con
17
The categories of this paper are: q-fin
13
The categories of this paper are: quant-ph
32
The categories of this paper are: atom-ph
8
The categories of this paper are: hep-ex
10
The categories of this paper are: q-bio