Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: An Approximate Analytical Algorithm for Evaluating the Distances in a
  Dark Energy Dominated Universe   The most recent cosmological observations indicate that the present universe
is flat and vacuum dominated. In such a universe, the distance measurements are
always difficult and involve numerical computations. In this paper, it is shown
that the most fundamental distance measurement of cosmology, the luminosity
distance, for such a universe can be obtained in an approximate analytical way
with very small errors of less than 0.02% up to %z = 5$ for any value of vacuum
energy. The analytical calculation is shown to be exceedingly efficient, as
compared to the traditional numerical methods.

29
The categories of this paper are: funct-an
33
The categories of this paper are: plasm-ph
34
The categories of this paper are: chem-ph
15
The categories of this paper are: nucl-ex
31
The categories of this paper are: ao-sci
18
The categories of this paper are: econ
4
The categories of this paper are: cond-mat
32
The categories of this paper are: atom-ph
24
The categories of this paper are: dg-ga
25
The categories of this paper are: patt-sol
10
The categories of this paper are: q-bio
27
The categories of this paper are: comp-gas
3
The categories of this paper are: physics
5
The categories of this paper are: gr-qc
23
The categories of this paper are: solv-int
2
The categories of this paper are: math