How many cosmological parameters?
نویسندگان
چکیده
منابع مشابه
How many cosmological parameters?
Constraints on cosmological parameters depend on the set of parameters chosen to define the model which is compared with observational data. I use the Akaike and Bayesian information criteria to carry out cosmological model selection, in order to determine the parameter set providing the preferred fit to the data. Applying the information criteria to the current cosmological data sets indicates...
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1550-7998=20 For exploring the physics behind the accelerating Universe a crucial question is how much we can learn about the dynamics through next generation cosmological experiments. For example, in defining the dark energy behavior through an effective equation of state, how many parameters can we realistically expect to tightly constrain? Through both general and specific examples (includin...
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The cosmological parameters that I will emphasize are the Hubble parameter H0 ≡ 100h km s −1 Mpc, the age of the universe t0, the average matter density Ωm, the baryonic matter density Ωb, the neutrino density Ων , and the cosmological constant ΩΛ. The evidence currently favors t0 ≈ 13 Gyr, h ≈ 0.65, Ωm ≈ 0.4 ± 0.1, Ωb = 0.02h , 0.001 < Ων < 0.1, and ΩΛ ≈ 0.7.
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The CMB anisotropy depends sensitively upon the slope and amplitude of primordial density and gravitational wave fluctuations, the baryon density, the Hubble constant, the cosmological constant, the ionization history, etc. We report on recent work showing how well multi-scale measurements of the anisotropy power spectrum can resolve these factors. We identify a hypersurface in cosmic parameter...
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I derive analytically the spectrum of the CMB fluctuations. The final result for Cl is presented in terms of elementary functions with an explicit dependence on the basic cosmological parameters. This result is in a rather good agreement with CMBFAST for a wide range of parameters around concordance model. This allows us to understand the physical reasons for dependence of the particular featur...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2004
ISSN: 0035-8711,1365-2966
DOI: 10.1111/j.1365-2966.2004.08033.x