The GRBs Hubble diagram in quintessential cosmological models
Marek Demianski, Ester Piedipalumbo, Claudio Rubano

TL;DR
This paper extends the use of gamma-ray bursts as standard candles for cosmology by calibrating their luminosity correlations in various dark energy models, and constructs a high-redshift Hubble diagram to test these models.
Contribution
It introduces a model-independent calibration of GRB correlations using SNIa data and applies this to build a high-redshift Hubble diagram in quintessential cosmological models.
Findings
GRB correlation parameters weakly depend on the cosmological model
Calibrated GRB Hubble diagram is consistent with estimated one
High-redshift GRBs can effectively test dark energy models
Abstract
It has been recently empirically established that some of the directly observed pa- rameters of GRBs are correlated with their important intrinsic parameters, like the luminosity or the total radiated energy. These correlations were derived, tested and used to standardize GRBs, i.e., to derive their luminosity or radiated energy from one or more observables, in order to construct an estimated fiducial Hubble diagram, assuming that radiation propagates in the standard LambdaCDM cosmological model. We extend these analyses by considering more general models of dark energy, and an updated data set of high redshift GRBs. We show that the correlation parameters only weakly depend on the cosmological model. Moreover we apply a local regression technique to estimate, in a model independent way, the distance modulus from the recently updated SNIa sample containing 307 SNIa (Astier et al. 2006),…
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