Recent progress in GRB cosmology: combination of GRBs and other probes

Abstract

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.