Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Formation of sharp edges and planar areas of asteroids by polyhedral
  abrasion   While the number of asteroids with known shapes has drastically increased
over the past few years, little is known on the the time-evolution of shapes
and the underlying physical processes. Here we propose an averaged abrasion
model based on micro-collisons, accounting for asteroids not necessarily
evolving toward regular spheroids, rather (depending on the fall-back rate of
ejecta) following an alternative path, thus confirming photometry-derived
features, e.g. existence of large, relatively flat areas separated by edges. We
show that our model is realistic, since the bulk of the collisions falls into
this category.

19
The categories of this paper are: eess
9
The categories of this paper are: nlin
24
The categories of this paper are: dg-ga
13
The categories of this paper are: quant-ph
5
The categories of this paper are: gr-qc
35
The categories of this paper are: mtrl-th
25
The categories of this paper are: patt-sol
23
The categories of this paper are: solv-int
3
The categories of this paper are: physics
32
The categories of this paper are: atom-ph
28
The categories of this paper are: alg-geom
22
The categories of this paper are: chao-dyn
11
The categories of this paper are: hep-lat
18
The categories of this paper are: econ
37
The categories of this paper are: supr-con
12
The categories of this paper are: nucl-th