منابع مشابه
Cosmological Parameters
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.
متن کاملCosmological Parameters
This article briefly summarizes the increasingly precise observational estimates of the cosmological parameters. After three years on the stump, the ΛCDM model is still the leading candidate. Although the Universe is expanding , our picture of it is coming together.
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Rapid advances in observational cosmology have led to the establishment of a precision cosmological model, with many of the key cosmological parameters determined to one or two significant figure accuracy. Particularly prominent are measurements of cosmic microwave background (CMB) anisotropies, led by the seven-year results from the Wilkinson Microwave Anisotropy Probe (WMAP) [1–3]. However th...
متن کاملConstraints on cosmological parameters
A cosmological model with total density close to critical (and flat geometry), dominated by dark matter and dark energy of unknown nature, and consistent with the basic predictions of the inflationary scenario is a very good fit to a variety of cosmological probes: the anisotropy of the CMB, the large scale distribution of matter, the luminosity distance of high-redshift type Ia supernovae and ...
متن کاملMeasuring cosmological parameters.
In this review, the status of measurements of the matter density (Omegam), the vacuum energy density or cosmological constant (OmegaLambda), the Hubble constant (H0), and the ages of the oldest measured objects (t0) are summarized. Three independent types of methods for measuring the Hubble constant are considered: the measurement of time delays in multiply imaged quasars, the Sunyaev-Zel'dovic...
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ژورنال
عنوان ژورنال: Pramana
سال: 1999
ISSN: 0304-4289,0973-7111
DOI: 10.1007/s12043-999-0046-3