Extending the Hubble diagram by gamma ray bursts

Details Extending the Hubble diagram by gamma ray bursts Extending the Hubble diagram by gamma ray bursts

2009-10-09

arxiv.org/abs/0910.1678v1

Astronomy and Astrophysics Volume 508, Issue 1, 2 December 2009, Pages 63-67

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

5 pages, 5 figures, to appear in Astron. & Astroph

Scientific paper

10.1051/0004-6361/200912769

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. We find that GRBs, calibrated by SNeIa, could be good distance indicators capable of discriminating between cosmological models and $\Lambda$CDM model at high redshift.

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