Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The intergalactic Newtonian gravitational field and the shell theorem   The release of the 2MASS Redshift Survey (2MRS), with it's 44599 galaxies
allows the deduction of the galaxy's masses in nearly complete sample. A cubic
box with side of 37 Mpc containing 2429 galaxies is extracted and the Newtonian
gravitational field is evaluated both at the center of the box as well in 101 x
101 x 101 grid points of the box. The obtained results are then discussed at
the light of the shell theorem which states that at the internal of a sphere
the gravitational field is zero.

19
The categories of this paper are: eess
18
The categories of this paper are: econ
9
The categories of this paper are: nlin
15
The categories of this paper are: nucl-ex
11
The categories of this paper are: hep-lat
35
The categories of this paper are: mtrl-th
27
The categories of this paper are: comp-gas
1
The categories of this paper are: cs
32
The categories of this paper are: atom-ph
8
The categories of this paper are: hep-ex
36
The categories of this paper are: cmp-lg
7
The categories of this paper are: hep-th
22
The categories of this paper are: chao-dyn
3
The categories of this paper are: physics
26
The categories of this paper are: bayes-an
10
The categories of this paper are: q-bio