Abstract
We study the behavior of the parameter w(z) of the dark-energy equation of state, Px = w(z)ρx, as function of the redshift data from GRBs, to check its deviations from its most accepted value of −1. To this end we first find a reasonable calibration for the GRB in order to extract the luminosity distance dL as a function of the redshift. Then we proceed to calculate the Hubble function H(z) and w(z).
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