Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Notes on the compatibility of type Ia supernovae data and varying--$G$
  cosmology   Observational data for type Ia supernovae, shows that the expansion of the
universe is accelerated. This accelerated expansion can be described by a
cosmological constant or by dark energy models like quintessence. An
interesting question may be raised here. Is it possible to describe the
accelerated expansion of universe using varying--$G$ cosmological models? Here
we shall show that the price for having accelerated expansion in
slow--varying--$G$ models (in which the dynamical terms of $G$ are ignored) is
to have highly non--conserved matter and also that it is in contradiction with
other data.

29
The categories of this paper are: funct-an
17
The categories of this paper are: q-fin
31
The categories of this paper are: ao-sci
7
The categories of this paper are: hep-th
13
The categories of this paper are: quant-ph
27
The categories of this paper are: comp-gas
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
26
The categories of this paper are: bayes-an
16
The categories of this paper are: stat
30
The categories of this paper are: q-alg
15
The categories of this paper are: nucl-ex
10
The categories of this paper are: q-bio
36
The categories of this paper are: cmp-lg
11
The categories of this paper are: hep-lat
18
The categories of this paper are: econ