Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Planetesimal disk evolution driven by planetesimal-planetesimal
  gravitational scattering   We investigate the process of an inhomogeneous planetesimal disk evolution
caused by the planetesimal-planetesimal gravitational scattering. We develop a
rather general approach based on the kinetic theory which self-consistently
describes the evolution in time and space of both the disk surface density and
its kinematic properties -- dispersions of eccentricity and inclination. The
gravitational scattering of planetesimals is assumed to be in the
dispersion-dominated regime which considerably simplifies analytical treatment.
The resultant equations are of advection-diffusion type. Distance dependent
scattering coefficients entering these equations are calculated analytically
under the assumption of two-body scattering in the leading order in Coulomb
logarithm. They are essentially nonlocal in nature. Our approach allows one to
explore the dynamics of nonuniform planetesimal disks with arbitrary mass and
random velocity distributions. It can also naturally include other physical
mechanisms which are important for the evolution of such disks -- gas drag,
migration, and so on.

4
The categories of this paper are: cond-mat
10
The categories of this paper are: q-bio
15
The categories of this paper are: nucl-ex
9
The categories of this paper are: nlin
31
The categories of this paper are: ao-sci
20
The categories of this paper are: acc-phys
11
The categories of this paper are: hep-lat
37
The categories of this paper are: supr-con
21
The categories of this paper are: adap-org
32
The categories of this paper are: atom-ph
3
The categories of this paper are: physics
2
The categories of this paper are: math
36
The categories of this paper are: cmp-lg
0
The categories of this paper are: hep-ph
17
The categories of this paper are: q-fin
29
The categories of this paper are: funct-an