Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dark energy as stimulated emission of gravitons from a background brane   The idea that dark energy is gravitational waves may explain its strength and
its time-evolution provided that the additional energy comes from a background.
A possible concept is that dark energy is the ensemble of coherent bursts
(solitons) of gravitational waves originally produced by stimulated emission
when the first generation of super-massive black holes was formed. These
solitons get their initial energy as well as keep up their energy density
throughout the evolution of the universe by stimulating emission from a
background brane. We model this process by working out this energy transfer in
a Boltzmann equation approach. The transit of these gravitational wave solitons
may be detectable. Key tests include pulsar timing, clock jitter and the radio
and neutrino backgrounds.

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The categories of this paper are: comp-gas
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The categories of this paper are: bayes-an
18
The categories of this paper are: econ
7
The categories of this paper are: hep-th
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The categories of this paper are: q-fin
4
The categories of this paper are: cond-mat
12
The categories of this paper are: nucl-th
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The categories of this paper are: nucl-ex
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The categories of this paper are: mtrl-th
16
The categories of this paper are: stat
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The categories of this paper are: chem-ph
3
The categories of this paper are: physics
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The categories of this paper are: funct-an
9
The categories of this paper are: nlin
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The categories of this paper are: adap-org
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The categories of this paper are: eess