Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Constraints on holographic dark energy from type Ia supernova
  observations   In this paper, we use the type Ia supernovae data to constrain the
holographic dark energy model proposed by Li. We also apply a cosmic age test
to this analysis. We consider in this paper a spatially flat
Friedmann-Robertson-Walker Universe with matter component and holographic dark
energy component. The fit result shows that the case $c<1$ ($c=0.21$) is
favored, which implies that the holographic dark energy behaves as a
quintom-type dark energy. Furthermore, we also perform a joint analysis of
SNe+CMB+LSS to this model; the result is well improved, and still upholds the
quintom dark energy conclusion. The best fit results in our analysis are
$c=0.81$, $\Omega_m^0=0.28$, and $h=0.65$, which lead to the present equation
of state of dark energy $w_0=-1.03$ and the deceleration/acceleration
transition redshift $z_T=0.63$. Finally, an expected SNAP simulation using
$\Lambda$CDM as a fiducial model is performed on this model, and the result
shows that the holographic dark energy model takes on $c<1$ ($c=0.92$) even
though the dark energy is indeed a cosmological constant.

15
The categories of this paper are: nucl-ex
19
The categories of this paper are: eess
34
The categories of this paper are: chem-ph
24
The categories of this paper are: dg-ga
9
The categories of this paper are: nlin
5
The categories of this paper are: gr-qc
14
The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg
35
The categories of this paper are: mtrl-th
28
The categories of this paper are: alg-geom
17
The categories of this paper are: q-fin
8
The categories of this paper are: hep-ex
18
The categories of this paper are: econ
30
The categories of this paper are: q-alg
12
The categories of this paper are: nucl-th
33
The categories of this paper are: plasm-ph