Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Streaming instabilities in accreting and magnetized laminar
  protoplanetary disks   The streaming instability is one of the most promising pathways to the
formation of planetesimals from pebbles. Understanding how this instability
operates under realistic conditions expected in protoplanetary disks is
therefore crucial to assess the efficiency of planet formation. Contemporary
models of protoplanetary disks show that magnetic fields are key to driving gas
accretion through large-scale, laminar magnetic stresses. However, the effect
of such magnetic fields on the streaming instability has not been examined in
detail. To this end, we study the stability of dusty, magnetized gas in a
protoplanetary disk. We find the streaming instability can be enhanced by
passive magnetic torques and even persist in the absence of a global radial
pressure gradient. In this case, instability is attributed to the azimuthal
drift between dust and gas, unlike the classical streaming instability, which
is driven by radial drift. This suggests that the streaming instability can
remain effective inside dust-trapping pressure bumps in accreting disks. When a
live vertical field is considered, we find the magneto-rotational instability
can be damped by dust feedback, while the classic streaming instability can be
stabilized by magnetic perturbations. We also find that Alfv\'en waves can be
destabilized by dust-gas drift, but this instability requires nearly ideal
conditions. We discuss the possible implications of these results for dust
dynamics and planetesimal formation in protoplanetary disks.

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The categories of this paper are: hep-th
31
The categories of this paper are: ao-sci
36
The categories of this paper are: cmp-lg
20
The categories of this paper are: acc-phys
24
The categories of this paper are: dg-ga
35
The categories of this paper are: mtrl-th
5
The categories of this paper are: gr-qc
14
The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
13
The categories of this paper are: quant-ph
19
The categories of this paper are: eess
0
The categories of this paper are: hep-ph
22
The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
15
The categories of this paper are: nucl-ex
2
The categories of this paper are: math