Volume 508, Number 1, December II 2009
|Page(s)||63 - 67|
|Section||Cosmology (including clusters of galaxies)|
|Published online||08 October 2009|
Extending the Hubble diagram by gamma ray bursts
Dipartimento di Scienze Fisiche, Università di Napoli “Federico II” and INFN Sez. di Napoli, Compl. Univ. Monte S. Angelo, Ed. N, via Cinthia, 80126 Napoli, Italy e-mail: email@example.com
2 ICRANet and ICRA, Piazzale della Repubblica 10, 65122 Pescara, Italy
3 Dip. di Fisica, Università di Roma “La Sapienza”, Piazzale Aldo Moro 5, 00185 Roma, Italy
4 INAF – VSTceN, Salita Moiariello 16, 80131 Napoli, Italy
Accepted: 10 September 2009
Aims. A new method to constrain the cosmological equation of state is proposed by using combined samples of gamma-ray bursts (GRBs) and supernovae (SNeIa).
Methods. The Chevallier-Polarski-Linder parameterization is adopted for the equation of state in order to find a realistic approach to achieve the deceleration/acceleration transition phase of dark energy models.
Results. We find that GRBs, calibrated by SNeIa, could be good distance indicators capable of discriminating between cosmological models and ΛCDM model at high redshift.
Key words: gamma rays: bursts / cosmological parameters / distance scale
© ESO, 2009
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