Model-independent distance measurements from gamma-ray bursts and constraints on dark energy
作者： Yun Wang
DOI: 10.1103/PHYSREVD.78.123532
关键词:
摘要: Gamma-ray bursts (GRB) are the most energetic events in Universe and provide a complementary probe of dark energy by allowing measurement cosmic expansion history that extends to redshifts greater than 6. Unlike type Ia supernovae (SNe Ia), GRBs must be calibrated for each cosmological model considered, because lack nearby sample model-independent calibration. For flat universe with constant, we find {omega}{sub m}=0.25{sub -0.11}{sup +0.12} from 69 alone. We show current GRB data can summarized set distance measurements, negligible loss information. constrain equation state linear scale factor using these measurements GRBs, together ''Union'' compilation SNe Ia, WMAP five-year observations, SDSS (Sloan Digital Sky Survey) baryon acoustic oscillation measurement. constant is consistent at 68% confidence level universe. Our results simple robust method incorporate joint analysis energy.
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