Observational constraints on cosmological models with the updated long gamma-ray bursts

Journal Article · Sun Aug 01 04:00:00 EDT 2010 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2010/08/020· OSTI ID:22272816

Wei, Hao ^[1]

---

1. Department of Physics, Beijing Institute of Technology, Beijing 100081 (China)

In the present work, by the help of the newly released Union2 compilation which consists of 557 Type Ia supernovae (SNIa), we calibrate 109 long Gamma-Ray Bursts (GRBs) with the well-known Amati relation, using the cosmology-independent calibration method proposed by Liang et al.. We have obtained 59 calibrated high-redshift GRBs which can be used to constrain cosmological models without the circularity problem (we call them ''Hymnium'' GRBs sample for convenience). Then, we consider the joint constraints on 7 cosmological models from the latest observational data, namely, the combination of 557 Union2 SNIa dataset, 59 calibrated Hymnium GRBs dataset (obtained in this work), the shift parameter R from the WMAP 7-year data, and the distance parameter A of the measurement of the baryon acoustic oscillation (BAO) peak in the distribution of SDSS luminous red galaxies. We also briefly consider the comparison of these 7 cosmological models.

• OSTI ID: 22272816
• Journal Information: Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 08 Vol. 2010; ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
BARYONS
CALIBRATION
COMPARATIVE EVALUATIONS
COSMIC GAMMA BURSTS
COSMOLOGICAL MODELS
COSMOLOGY
GALAXIES
LIMITING VALUES
OSCILLATIONS
RED SHIFT
SUPERNOVAE