Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Natural Quintessence?   We formulate conditions for the naturalness of cosmological quintessence
scenarios. The quintessence lagrangian is taken to be the sum of a simple
exponential potential and a non-canonical kinetic term. This parameterization
covers most variants of quintessence and makes the naturalness conditions
particularly transparent. Several ``natural'' scalar models lead, for the
present cosmological era, to a large fraction of homogeneous dark energy
density and an acceleration of the scale factor as suggested by observation.

16
The categories of this paper are: stat
25
The categories of this paper are: patt-sol
10
The categories of this paper are: q-bio
8
The categories of this paper are: hep-ex
1
The categories of this paper are: cs
4
The categories of this paper are: cond-mat
17
The categories of this paper are: q-fin
24
The categories of this paper are: dg-ga
32
The categories of this paper are: atom-ph
13
The categories of this paper are: quant-ph
36
The categories of this paper are: cmp-lg
2
The categories of this paper are: math
35
The categories of this paper are: mtrl-th
27
The categories of this paper are: comp-gas
19
The categories of this paper are: eess
9
The categories of this paper are: nlin