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• W2030941115 endingPage "610" @default.
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• W2030941115 abstract "Three different methods of measuring cosmology with gamma-ray bursts (GRBs) have been proposed since a relation between the gamma-ray energy Eγ of a GRB jet and the peak energy Ep of the νFν spectrum in the burst frame was reported by Ghirlanda and coauthors. In method I, to calculate the probability for a favored cosmology, only the contribution of the Eγ-Ep relation that is already best-fitted for this cosmology is considered. We apply this method to a sample of 17 GRBs and obtain the mass density ΩM = 0.15 (1 σ) for a flat ΛCDM universe. In method II, to calculate the probability for some certain cosmology, contributions of all the possible Eγ-Ep relations that are best-fitted for their corresponding cosmologies are taken into account. With this method, we find a constraint on the mass density 0.14 < ΩM < 0.69 (1 σ) for a flat universe. In method III, to obtain the probability for some cosmology, contributions of all the possible Eγ-Ep relations associated with their unequal weights are considered. With this method, we obtain an inspiring constraint on the mass density 0.16 < ΩM < 0.45 (1 σ) for a flat universe and χ = 19.08/15 = 1.27 for the concordance model of ΩM = 0.27. Compared with the previous two methods, method III makes the observed 17 GRBs place much more stringent confidence intervals at the same confidence levels. Furthermore, we perform a Monte Carlo simulation and use a larger sample to investigate the cosmographic capabilities of GRBs with different methods. We find that a larger GRB sample could be used to effectively measure cosmology, no matter whether the Eγ-Ep relation is calibrated by low-z bursts or not. Ongoing observations of GRBs in the Swift era are expected to make the cosmological utility of GRBs progress from its babyhood into childhood." @default.
• W2030941115 created "2016-06-24" @default.
• W2030941115 creator A5020226724 @default.
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• W2030941115 date "2005-11-10" @default.
• W2030941115 modified "2023-10-16" @default.
• W2030941115 title "Can Gamma‐Ray Bursts Be Used to Measure Cosmology? A Further Analysis" @default.
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• W2030941115 doi "https://doi.org/10.1086/466509" @default.
• W2030941115 hasPublicationYear "2005" @default.
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