Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: An Accelerating Cosmology Without Dark Energy   The negative pressure accompanying gravitationally-induced particle creation
can lead to a cold dark matter (CDM) dominated, accelerating Universe (Lima et
al. 1996) without requiring the presence of dark energy or a cosmological
constant. In a recent study Lima et al. (2008, LSS) demonstrated that particle
creation driven cosmological models are capable of accounting for the SNIa
observations of the recent transition from a decelerating to an accelerating
Universe. Here we test the evolution of such models at high redshift using the
constraint on z_eq, the redshift of the epoch of matter radiation equality,
provided by the WMAP constraints on the early Integrated Sachs-Wolfe effect.
Since the contribution of baryons and radiation was ignored in the work of LSS,
we include them in our study of this class of models. The parameters of these
more realistic models with continuous creation of CDM is tested and constrained
at widely-separated epochs (z = z_eq and z = 0) in the evolution of the
Universe. This comparison reveals a tension between the high redshift CMB
constraint on z_eq and that which follows from the low redshift SNIa data,
challenging the viability of this class of models.

19
The categories of this paper are: eess
32
The categories of this paper are: atom-ph
2
The categories of this paper are: math
14
The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
11
The categories of this paper are: hep-lat
27
The categories of this paper are: comp-gas
36
The categories of this paper are: cmp-lg
4
The categories of this paper are: cond-mat
23
The categories of this paper are: solv-int
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The categories of this paper are: funct-an
30
The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph
20
The categories of this paper are: acc-phys