Wei 2008 用超新星矫正伽玛暴的标准烛光关系

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arXiv:0808.2240 [ps, pdf, other]

Title: Calibrating Gamma-Ray Bursts to Reconstruct the Cosmic Expansion History up to Redshift z=6.29

Authors: Hao Wei, Shuang Nan Zhang

Comments: 12 pages, 4 figures, 1 table, revtex4

Subjects: Astrophysics (astro-ph); General Relativity and Quantum Cosmology (gr-qc); High Energy Physics - Theory (hep-th)

Recently, Gamma-Ray Bursts (GRBs) were proposed to be a complementary probe to type Ia supernovae (SNIa). GRBs have been advocated to be standard candles since several empirical GRB luminosity relations were proposed as distance indicators. However, there is a so-called circularity problem in the direct use of GRBs. Recently, a new idea to calibrate GRBs in a completely cosmology independent manner has been proposed, and the circularity problem can be solved. In the present work, following the method proposed by Liang et al., we calibrate 70 GRBs with the Amati relation using 307 SNIa. Then, we smoothly reconstruct the cosmic expansion history up to redshift z=6.29 with the calibrated GRBs. We find some new features in the reconstructed results.