Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quintessence, super-quintessence and observable quantities in
  Brans-Dicke and non-minimally coupled theories   The different definitions for the equation of state of a non-minimally
coupled scalar field that have been introduced in the literature are analyzed.
Particular emphasis is made upon those features that could yield to an
observable way of distinguishing non-minimally coupled theories from General
Relativity, with the same or with alternate potentials. It is found that some
earlier claims on that super-quintessence, a stage of super-accelerated
expansion of the universe, is possible within realistic non-minimally coupled
theories are the result of an arguable definition of the equation of state. In
particular, it is shown that these previous results do not import any
observable consequence, i.e. that the theories are observationally identical to
General Relativity models and that super-quintessence is not more than a
mathematical outcome. Finally, in the case of non-minimally coupled theories
with coupling $F=1+\xi \phi^2$ and tracking potentials, it is shown that no
super-quintessence is possible.

28
The categories of this paper are: alg-geom
14
The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
29
The categories of this paper are: funct-an
0
The categories of this paper are: hep-ph
36
The categories of this paper are: cmp-lg
2
The categories of this paper are: math
21
The categories of this paper are: adap-org
22
The categories of this paper are: chao-dyn
8
The categories of this paper are: hep-ex
25
The categories of this paper are: patt-sol
19
The categories of this paper are: eess
23
The categories of this paper are: solv-int
35
The categories of this paper are: mtrl-th
24
The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph