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Title: Constraints on Λ(t)CDM models as holographic and agegraphic dark energy with the observational Hubble parameter data

Abstract

The newly released observational H(z) data (OHD) is used to constrain Λ(t)CDM models as holographic and agegraphic dark energy. By the use of the length scale and time scale as the IR cut-off including Hubble horizon (HH), future event horizon (FEH), age of the universe (AU), and conformal time (CT), we achieve four different Λ(t)CDM models which can describe the present cosmological acceleration respectively. In order to get a comparison between such Λ(t)CDM models and standard ΛCDM model, we use the information criteria (IC), Om(z) diagnostic, and statefinder diagnostic to measure the deviations. Furthermore, by simulating a larger Hubble parameter data sample in the redshift range of 0.1 < z < 2.0, we get the improved constraints and more sufficient comparison. We show that OHD is not only able to play almost the same role in constraining cosmological parameters as SNe Ia does but also provides the effective measurement of the deviation of the DE models from standard ΛCDM model. In the holographic and agegraphic scenarios, the results indicate that the FEH is more preferable than HH scenario. However, both two time scenarios show better approximations to ΛCDM model than the length scenarios.

Authors:
;  [1];  [2]
  1. Department of Physics, Institute of Theoretical Physics, Beijing Normal University, Beijing, 100875 (China)
  2. Department of Astronomy, Beijing Normal University, Beijing, 100875 (China)
Publication Date:
OSTI Identifier:
22277809
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2011; Journal Issue: 08; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACCELERATION; APPROXIMATIONS; COMPARATIVE EVALUATIONS; COSMOLOGICAL CONSTANT; COSMOLOGY; LIMITING VALUES; NONLUMINOUS MATTER; RED SHIFT; UNIVERSE

Citation Formats

Zhai, Zhong-Xu, Liu, Wen-Biao, and Zhang, Tong-Jie, E-mail: zzx@mail.bnu.edu.cn, E-mail: tjzhang@bnu.edu.cn, E-mail: wbliu@bnu.edu.cn. Constraints on Λ(t)CDM models as holographic and agegraphic dark energy with the observational Hubble parameter data. United States: N. p., 2011. Web. doi:10.1088/1475-7516/2011/08/019.
Zhai, Zhong-Xu, Liu, Wen-Biao, & Zhang, Tong-Jie, E-mail: zzx@mail.bnu.edu.cn, E-mail: tjzhang@bnu.edu.cn, E-mail: wbliu@bnu.edu.cn. Constraints on Λ(t)CDM models as holographic and agegraphic dark energy with the observational Hubble parameter data. United States. doi:10.1088/1475-7516/2011/08/019.
Zhai, Zhong-Xu, Liu, Wen-Biao, and Zhang, Tong-Jie, E-mail: zzx@mail.bnu.edu.cn, E-mail: tjzhang@bnu.edu.cn, E-mail: wbliu@bnu.edu.cn. Mon . "Constraints on Λ(t)CDM models as holographic and agegraphic dark energy with the observational Hubble parameter data". United States. doi:10.1088/1475-7516/2011/08/019.
@article{osti_22277809,
title = {Constraints on Λ(t)CDM models as holographic and agegraphic dark energy with the observational Hubble parameter data},
author = {Zhai, Zhong-Xu and Liu, Wen-Biao and Zhang, Tong-Jie, E-mail: zzx@mail.bnu.edu.cn, E-mail: tjzhang@bnu.edu.cn, E-mail: wbliu@bnu.edu.cn},
abstractNote = {The newly released observational H(z) data (OHD) is used to constrain Λ(t)CDM models as holographic and agegraphic dark energy. By the use of the length scale and time scale as the IR cut-off including Hubble horizon (HH), future event horizon (FEH), age of the universe (AU), and conformal time (CT), we achieve four different Λ(t)CDM models which can describe the present cosmological acceleration respectively. In order to get a comparison between such Λ(t)CDM models and standard ΛCDM model, we use the information criteria (IC), Om(z) diagnostic, and statefinder diagnostic to measure the deviations. Furthermore, by simulating a larger Hubble parameter data sample in the redshift range of 0.1 < z < 2.0, we get the improved constraints and more sufficient comparison. We show that OHD is not only able to play almost the same role in constraining cosmological parameters as SNe Ia does but also provides the effective measurement of the deviation of the DE models from standard ΛCDM model. In the holographic and agegraphic scenarios, the results indicate that the FEH is more preferable than HH scenario. However, both two time scenarios show better approximations to ΛCDM model than the length scenarios.},
doi = {10.1088/1475-7516/2011/08/019},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 08,
volume = 2011,
place = {United States},
year = {Mon Aug 01 00:00:00 EDT 2011},
month = {Mon Aug 01 00:00:00 EDT 2011}
}