Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Generalized phantom energy   We examine cosmological models with generalized phantom energy (GPE).
Generalized phantom energy satisfies the supernegative equation of state, but
its evolution with the scale factor is generally independent, i.e. not
determined by its equation of state. The requirement of general covariance
makes the gravitational constant time-dependent. It is found that a large class
of distinct GPE models with different evolution of generalized phantom energy
density and gravitational constant, but the same equation of state of GPE have
the same evolution of the scale factor of the universe in the distant future.
The time dependence of the equation of state parameter determines whether the
universe will end in a de Sitter-like phase or diverge in finite time with the
accompanying "Big Rip" effect on the bound structures.

26
The categories of this paper are: bayes-an
25
The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph
14
The categories of this paper are: math-ph
9
The categories of this paper are: nlin
13
The categories of this paper are: quant-ph
3
The categories of this paper are: physics
17
The categories of this paper are: q-fin
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: comp-gas
29
The categories of this paper are: funct-an
11
The categories of this paper are: hep-lat
19
The categories of this paper are: eess
34
The categories of this paper are: chem-ph
10
The categories of this paper are: q-bio