Constraints on $w_0$ and $w_a$ of Dark Energy from High Redshift Gamma Ray Bursts

Abstract

We extend the Hubble diagram up to $z=5.6$ using 63 gamma-ray bursts (GRBs) via peak energy-peak luminosity relation (so called Yonetoku relation), and obtain constraints on cosmological parameters including dynamical dark energy parametrized by $P/\rho \equiv w(z)=w_0+w_a\cdot z/(1+z)$. It is found that the current GRB data are consistent with the concordance model, (${\Omega }_m=0.28,{\Omega }_{\Lambda }=0.72,w_0=-1,w_a=0$), within two sigma level. Although constraints from GRBs themselves are not so strong, they can improve the conventional constraints from SNeIa because GRBs have much higher redshifts. Further we estimate the constraints on the dark-energy parameters expected by future observations with GLAST (Gamma-ray Large Area Space Telescope) and \swift by Monte-Carlo simulation. Constraints would improve substantially with another 150 GRBs.

5 pages, 6 figures. Submitted tu MNRAS

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Cited by in corpus (5)

• Theoretical Models of Dark Energy
• Gamma-ray Burst Cosmology
• Cosmological Constraints from calibrated Yonetoku and Amati relation implies Fundamental plane of Gamma-ray bursts
• Observational constraints on unified dark matter including Hubble parameter data
• Gamma-Ray Bursts are precise distance indicators similar to Type Ia Supernovae?