Cosmography by GRBs : Gamma Ray Bursts as possible distance indicators

Details Cosmography by GRBs : Gamma Ray Bursts as possible distance indicators Cosmography by GRBs : Gamma Ray Bursts as possible distance indicators

2009-06-16

arxiv.org/abs/0906.3025v2

Nucl.Phys.Proc.Suppl.194:206-211,2009

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

6 pages, 4 figures, Dark Energy Conference, Florence 2009

Scientific paper

10.1016/j.nuclphysbps.2009.07.02

A new method to constrain the cosmological equation of state is proposed by using combined samples of gamma-ray bursts (GRBs) and supernovae (SNeIa). The Chevallier-Polarski-Linder parameterization is adopted for the equation of state in order to find out a realistic approach to achieve the deceleration/acceleration transition phase of dark energy models. As results, we find that GRBs, calibrated by SNeIa, could be, at least, good distance indicators capable of discriminating cosmological models with respect to $\Lambda$CDM at high redshift.

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