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Title: Impacts on cosmological constraints from degeneracies

Abstract

In this paper, we study the degeneracies among several cosmological parameters in detail and discuss their impacts on the determinations of these parameters from the current and future observations. By combining the latest data sets, including type-Ia supernovae ''Union2.1'' compilation, WMAP seven-year data and the baryon acoustic oscillations from the SDSS Data Release Seven, we perform a global analysis to determine the cosmological parameters, such as the equation of state of dark energy w, the curvature of the universe Ω{sub k}, the total neutrino mass Σm{sub ν}, and the parameters associated with the power spectrum of primordial fluctuations (n{sub s}, α{sub s} and r). We pay particular attention on the degeneracies among these parameters and the influences on their constraints, by with or without including these degeneracies, respectively. We find that w and Ω{sub k} or Σm{sub ν} are strongly correlated. Including the degeneracies will significantly weaken the constraints. Furthermore, we study the capabilities of future observations and find these degeneracies can be broken very well. Consequently, the constraints of cosmological parameters can be improved dramatically.

Authors:
 [1];  [2]
  1. Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Science, P.O. Box 918-3, Beijing 100049 (China)
  2. Scuola Internazionale Superiore di Studi Avanzati, Via Bonomea 265, I-34136 Trieste (Italy)
Publication Date:
OSTI Identifier:
22279824
Resource Type:
Journal Article
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2012; Journal Issue: 11; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1475-7516
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; BARYONS; COSMOLOGICAL CONSTANT; COSMOLOGY; ENERGY SPECTRA; EQUATIONS OF STATE; FLUCTUATIONS; LIMITING VALUES; MASS; NEUTRINOS; NONLUMINOUS MATTER; OSCILLATIONS; SUPERNOVAE; UNIVERSE

Citation Formats

Li, Hong, and Xia, Jun-Qing, E-mail: hongli@ihep.ac.cn, E-mail: xia@sissa.it. Impacts on cosmological constraints from degeneracies. United States: N. p., 2012. Web. doi:10.1088/1475-7516/2012/11/039.
Li, Hong, & Xia, Jun-Qing, E-mail: hongli@ihep.ac.cn, E-mail: xia@sissa.it. Impacts on cosmological constraints from degeneracies. United States. doi:10.1088/1475-7516/2012/11/039.
Li, Hong, and Xia, Jun-Qing, E-mail: hongli@ihep.ac.cn, E-mail: xia@sissa.it. Thu . "Impacts on cosmological constraints from degeneracies". United States. doi:10.1088/1475-7516/2012/11/039.
@article{osti_22279824,
title = {Impacts on cosmological constraints from degeneracies},
author = {Li, Hong and Xia, Jun-Qing, E-mail: hongli@ihep.ac.cn, E-mail: xia@sissa.it},
abstractNote = {In this paper, we study the degeneracies among several cosmological parameters in detail and discuss their impacts on the determinations of these parameters from the current and future observations. By combining the latest data sets, including type-Ia supernovae ''Union2.1'' compilation, WMAP seven-year data and the baryon acoustic oscillations from the SDSS Data Release Seven, we perform a global analysis to determine the cosmological parameters, such as the equation of state of dark energy w, the curvature of the universe Ω{sub k}, the total neutrino mass Σm{sub ν}, and the parameters associated with the power spectrum of primordial fluctuations (n{sub s}, α{sub s} and r). We pay particular attention on the degeneracies among these parameters and the influences on their constraints, by with or without including these degeneracies, respectively. We find that w and Ω{sub k} or Σm{sub ν} are strongly correlated. Including the degeneracies will significantly weaken the constraints. Furthermore, we study the capabilities of future observations and find these degeneracies can be broken very well. Consequently, the constraints of cosmological parameters can be improved dramatically.},
doi = {10.1088/1475-7516/2012/11/039},
journal = {Journal of Cosmology and Astroparticle Physics},
issn = {1475-7516},
number = 11,
volume = 2012,
place = {United States},
year = {2012},
month = {11}
}