Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Model of the Universe including dark Energy   In this work we explore a model of the universe in which dark energy is
modelled explicitely with both a dynamical quintessence field (with a double
exponential self-interaction potential) and a cosmological constant. For a
given region of the parameter space, our results confirm the possibility of a
collapsing universe, which is necessary for an adequate definition of both
perturbative quantum field and string theories. We have also reproduced the
measurements of modulus distance from supernovae with good accuracy.

9
The categories of this paper are: nlin
15
The categories of this paper are: nucl-ex
23
The categories of this paper are: solv-int
31
The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio
27
The categories of this paper are: comp-gas
7
The categories of this paper are: hep-th
12
The categories of this paper are: nucl-th
18
The categories of this paper are: econ
26
The categories of this paper are: bayes-an
5
The categories of this paper are: gr-qc
33
The categories of this paper are: plasm-ph
36
The categories of this paper are: cmp-lg
1
The categories of this paper are: cs
3
The categories of this paper are: physics
29
The categories of this paper are: funct-an