Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Role of the Brans-Dicke scalar in the holographic description of dark
  energy   We study cosmological application of the holographic energy density in the
Brans-Dicke theory. Considering the holographic energy density as a dynamical
cosmological constant, it is more natural to study it in the Brans-Dicke theory
than in general relativity. Solving the Friedmann and Brans-Dicke field
equations numerically, we clarify the role of Brans-Dicke field during
evolution of the universe. When the Hubble horizon is taken as the IR cutoff,
the equation of state ($w_{\Lmd}$) for the holographic energy density is
determined to be 5/3 when the Brans-Dicke parameter $\omg$ goes infinity. This
means that the Brans-Dicke field plays a crucial role in determining the
equation of state. For the particle horizon IR cutoff, the Brans-Dicke scalar
mediates a transition from $w_{\Lmd} = -1/3$ (past) to $w_{\Lmd} = 1/3$
(future). If a dust matter is present, it determines future equation of state.
In the case of future event horizon cutoff, the role of the Brans-Dicke scalar
and dust matter are turned out to be trivial, whereas the holographic energy
density plays an important role as a dark energy candidate with $w_{\Lmd} =-1$.

28
The categories of this paper are: alg-geom
33
The categories of this paper are: plasm-ph
26
The categories of this paper are: bayes-an
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The categories of this paper are: supr-con
15
The categories of this paper are: nucl-ex
8
The categories of this paper are: hep-ex
2
The categories of this paper are: math
29
The categories of this paper are: funct-an
11
The categories of this paper are: hep-lat
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The categories of this paper are: comp-gas
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The categories of this paper are: eess
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The categories of this paper are: stat
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The categories of this paper are: dg-ga
12
The categories of this paper are: nucl-th
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The categories of this paper are: chao-dyn
10
The categories of this paper are: q-bio