Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Energy and Momentum in Expansive Nondecelerative Universe   Incorporation of the Vaidya metric in the model of Expansive Nondecelerative
Universe allows to precisely localize gravitational energy for weak fields and
obtain the components of the Einstein energy-momentum pseudotensor for strong
gravitational fields. The components are identical to those calculated by
Virbhadra.

24
The categories of this paper are: dg-ga
26
The categories of this paper are: bayes-an
7
The categories of this paper are: hep-th
2
The categories of this paper are: math
32
The categories of this paper are: atom-ph
29
The categories of this paper are: funct-an
28
The categories of this paper are: alg-geom
27
The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph
30
The categories of this paper are: q-alg
16
The categories of this paper are: stat
4
The categories of this paper are: cond-mat
1
The categories of this paper are: cs
13
The categories of this paper are: quant-ph
6
The categories of this paper are: astro-ph
19
The categories of this paper are: eess