Current observational constraints to the holographic dark energy model with a new infrared cutoff via the Markov chain Monte Carlo method

Journal Article · Thu Apr 15 00:00:00 EDT 2010 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.81.083523· OSTI ID:21431041

Yuting, Wang; Lixin, Xu ^[1]

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1. School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian, Liaoning 116024 (China)

In this paper, the holographic dark energy models with the new infrared cutoff for both the flat case and the nonflat case are confronted with the combined constraints of current cosmological observations: type Ia supernovae, baryon acoustic oscillations, current cosmic microwave background, and the observational Hubble data. By utilizing the Markov chain Monte Carlo method, we obtain the best fit values of the parameters with 1{sigma}, 2{sigma} errors in the flat model: {Omega}{sub b}h{sup 2}=0.0230{sub -0.0010-0.0014}{sup +0.0008+0.0012}, {alpha}=0.9788{sub -0.0927-0.1249}{sup +0.1297+0.1354}, {beta}=0.4739{sub -0.0723-0.0984}{sup +0.0793+0.1055}, {Omega}{sub de0}=0.7869{sub -0.0304-0.0455}{sup +0.0291+0.0370}, {Omega}{sub m0}=0.2131{sub -0.0291-0.0370}{sup +0.0304+0.0455}, H{sub 0}=70.46{sub -2.97-4.02}{sup +2.82+3.89}. In the nonflat model, the constraint results are found in 1{sigma}, 2{sigma} regions: {Omega}{sub b}h{sup 2}=0.0229{sub -0.0010-0.0014}{sup +0.0010+0.0013}, {Omega}{sub k}=0.0014{sub -0.0597-0.0743}{sup +0.0604+0.0604}, {alpha}=0.9637{sub -0.2840-0.3333}{sup +0.2291+0.2894}, {beta}=0.4712{sub -0.0756-0.0961}{sup +0.1412+0.1703}, {Omega}{sub de0}=0.7829{sub -0.2130-0.2386}{sup +0.1588+0.1901}, {Omega}{sub m0}=0.2157{sub -0.1012-0.1241}{sup +0.1562+0.1800}, H{sub 0}=70.64{sub -3.32-4.45}{sup +2.74+3.52}. In the best fit holographic dark energy models, the equation of state of dark energy and the deceleration parameter at present are characterized by w{sub de0}=-0.9278{+-}0.0626, q{sub 0}=-0.5951{+-}0.0586 (flat case) and w{sub de0}=-0.9501{+-}0.1442, q{sub 0}=-0.6164{+-}0.0805 (nonflat case). Compared to the {Lambda}CDM model, it is found the current combined data sets do not favor the holographic dark energy model over the {Lambda}CDM model.

• OSTI ID: 21431041
• Journal Information: Physical Review. D, Particles Fields, Vol. 81, Issue 8; Other Information: DOI: 10.1103/PhysRevD.81.083523; (c) 2010 The American Physical Society; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
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APPROXIMATIONS
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EQUATIONS OF STATE
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MONTE CARLO METHOD
NONLUMINOUS MATTER
OSCILLATIONS
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SUPERNOVAE
BINARY STARS
CALCULATION METHODS
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ELEMENTARY PARTICLES
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ERUPTIVE VARIABLE STARS
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HADRONS
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