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Observational constraints on holographic dark energy with varying gravitational constant

Jianbo Lu
(
- Dalian U. Tech.
)
,
Emmanuel N. Saridakis
(
- CUPT, Chongqing
)
,
M.R. Setare
(
- Kurdistan U.
)
,
Lixin Xu
(
- Dalian U. Tech.
)

Dec, 2009

8 pages

Published in:

JCAP 03 (2010) 031

e-Print:

0912.0923 [astro-ph.CO]

DOI:

10.1088/1475-7516/2010/03/031

View in:

ADS Abstract Service

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Abstract: (arXiv)

We use observational data from Type Ia Supernovae (SN), Baryon Acoustic Oscillations (BAO), Cosmic Microwave Background (CMB) and observational Hubble data (OHD), and the Markov Chain Monte Carlo (MCMC) method, to constrain the cosmological scenario of holographic dark energy with varying gravitational constant. We consider both flat and non-flat background geometry, and we present the corresponding constraints and contour-plots of the model parameters. We conclude that the scenario is compatible with observations. In 1

\sigma

we find

\Omega_{\Lambda0}=0.72^{+0.03}_{-0.03}

,

\Omega_{k0}=-0.0013^{+0.0130}_{-0.0040}

,

c=0.80^{+0.19}_{-0.14}

and

\Delta_G\equiv G'/G=-0.0025^{+0.0080}_{-0.0050}

, while for the present value of the dark energy equation-of-state parameter we obtain

w_0=-1.04^{+0.15}_{-0.20}

.

Note:

12 pages, 2 figures, version published in JCAP

95.36.+x
98.80.-k
98.80.Es
dark energy: holography
gravitation: fundamental constant
time dependence
dark energy: equation of state
baryon: oscillation: acoustic
background: geometry
cosmic background radiation

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