Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc..968...18d&link_type=abstract
ASTROPHYSICS OF COMPACT OBJECTS: International Conference on Astrophysics of Compact Objects. AIP Conference Proceedings, Volum
Astronomy and Astrophysics
Astrophysics
1
Cosmology, Gamma-Ray Sources, Gamma-Ray Bursts, Dark Energy, Distances, Redshifts, Radial Velocities, Spatial Distribution Of Galaxies
Scientific paper
It was widely shown that the cosmological parameters and dark energy can be constrained by using data from type-Ia supernovae (SNe Ia), cosmic microwave background (CMB) anisotropy, cosmic large scale structure, and so on. Recently gamma-ray bursts (GRBs) were also argued to be promising standard candles for cosmography. In this paper, we summarize the results of Wang et al. (2007). We present constraints on the cosmological parameters and dark energy by combining a recent GRB sample with other cosmological probes. We find that for the ΛCDM cosmology this combination makes the constraints stringent and the best fit is close to the flat universe. We also find that several dark energy models used usually are consistent with the ΛCDM cosmology. Furthermore, we reconstruct the dark energy equation-of-state parameter w(z) and the deceleration parameter q(z), and obtain the transition redshift of cosmic past deceleration to present acceleration.
Dai Gao Z.
Wang Feng-Yu
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