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Search: authors:"Yungui Gong"

3 papers found.
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The effect of different observational data on the constraints of cosmological parameters

The constraints on the Λ cold dark matter (ΛCDM) model from Type Ia supernova (SNe Ia) data alone and baryon acoustic oscillation (BAO) data alone are similar, so it is worthwhile to compare their constraints on the property of dark energy. We apply the three-year Supernova Legacy Survey (SNLS3) compilation of 472 SNe Ia data, the BAO measurement of distance, the cosmic microwave...

Current cosmological constraints on the curvature, dark energy and modified gravity

We apply the Union2 compilation of 557 supernova Ia data, the baryon acoustic oscillation measurement of distance, the cosmic microwave background radiation data from the 7-year Wilkinson Microwave Anisotropy Probe, and the Hubble parameter data to study the geometry of the Universe and the property of dark energy by using models and parametrizations with different high-redshift...

Supernova constraints on alternative models to dark energy

The recent observations of Type Ia supernovae suggest that the Universe is accelerating now and decelerated in the recent past. This may be the evidence of the breakdown of the standard Friedmann equation. The Friedmann equation H2∼ρ is modified to be a general form H2=g(ρ). Three models with particular form of g(ρ) are considered in detail. The supernova data published by Tonry...