Cosmography by Gamma Ray Bursts
نویسندگان
چکیده
Aims. Relations connecting Gamma Ray Burst quantities can be used to constrain cosmographic parameters of the Hubble law at medium-high redshifts. Methods. We consider a sample of 27 Gamma Ray Bursts to construct the luminosity distance-redshift relation and derive the values of the parameters q 0 , j 0 and s 0. The analysis is compared with other methods present in literature. Results. Gamma Ray Bursts, when calibrated by SNeIa, seem reliable as distance indicators and give cosmographic parameters in agreement with the ΛCDM model.
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