Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A new extended quintessence   Extended quintessence is obtained by coupling a normal scalar field to the
Ricci scalar defined in the metric formalism. In this paper, we propose a new
extended quintessence dark energy by introducing a non-minimal coupling between
the quintessence and gravity, but with the Ricci scalar given from the Palatini
formalism rather than the metric one. We find that the equation of state of the
new extended quintessence can cross the phantom divide line, and moreover, it
oscillates around the -1 line. We also show that the universe driven by the new
extended quintessence will enter a dark energy dominated de Sitter phase in the
future.

14
The categories of this paper are: math-ph
29
The categories of this paper are: funct-an
4
The categories of this paper are: cond-mat
3
The categories of this paper are: physics
7
The categories of this paper are: hep-th
27
The categories of this paper are: comp-gas
9
The categories of this paper are: nlin
21
The categories of this paper are: adap-org
24
The categories of this paper are: dg-ga
35
The categories of this paper are: mtrl-th
16
The categories of this paper are: stat
10
The categories of this paper are: q-bio
34
The categories of this paper are: chem-ph
33
The categories of this paper are: plasm-ph
26
The categories of this paper are: bayes-an
20
The categories of this paper are: acc-phys