Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Negative Energies and a Constantly Accelerating Flat Universe   It has been shown that in the context of General Relativity (GR) enriched
with a new set of discrete symmetry reversal conjugate metrics, negative energy
states can be rehabilitated while avoiding the well-known instability issues.
We review here some cosmological implications of the model and confront them
with the supernovae and CMB data. The predicted flat universe constantly
accelerated expansion phase is found to be in rather good agreement with the
most recent cosmological data.

14
The categories of this paper are: math-ph
16
The categories of this paper are: stat
26
The categories of this paper are: bayes-an
4
The categories of this paper are: cond-mat
20
The categories of this paper are: acc-phys
8
The categories of this paper are: hep-ex
0
The categories of this paper are: hep-ph
2
The categories of this paper are: math
21
The categories of this paper are: adap-org
10
The categories of this paper are: q-bio
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The categories of this paper are: nlin
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The categories of this paper are: nucl-th
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The categories of this paper are: alg-geom
33
The categories of this paper are: plasm-ph
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The categories of this paper are: cmp-lg
7
The categories of this paper are: hep-th