Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: TreePM: A code for Cosmological N-Body Simulations   We describe the TreePM method for carrying out large N-Body simulations to
study formation and evolution of the large scale structure in the Universe.
This method is a combination of Barnes and Hut tree code and Particle-Mesh
code. It combines the automatic inclusion of periodic boundary conditions of PM
simulations with the high resolution of tree codes. This is done by splitting
the gravitational force into a short range and a long range component. We
describe the splitting of force between these two parts. We outline the key
differences between TreePM and some other N-Body methods.

14
The categories of this paper are: math-ph
18
The categories of this paper are: econ
25
The categories of this paper are: patt-sol
0
The categories of this paper are: hep-ph
35
The categories of this paper are: mtrl-th
21
The categories of this paper are: adap-org
17
The categories of this paper are: q-fin
15
The categories of this paper are: nucl-ex
28
The categories of this paper are: alg-geom
33
The categories of this paper are: plasm-ph
20
The categories of this paper are: acc-phys
36
The categories of this paper are: cmp-lg
30
The categories of this paper are: q-alg
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The categories of this paper are: dg-ga
13
The categories of this paper are: quant-ph
7
The categories of this paper are: hep-th