What Can Gamma Ray Bursts Teach Us About Dark Energy?

Abstract

It has been suggested that Gamma Ray Bursts (GRB) may enable the expansion rate of our Universe to be measured out to very high redshifts ($z \gsim 5$) just as type Ia supernovae have done at $z\sim$1--1.5. We explore this possibility here, and find that GRB have the potential to detect dark energy at high statistical significance, but they are unlikely to be competitive with future supernovae missions, such as SNAP, in measuring the properties of the dark energy. The exception to this conclusion is if there is appreciable dark energy at early times, in which case the information from GRB's will provide an excellent complement to the $z\sim 1$ information from supernovae.

arXiv comment5 pages, 9 figures

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• Dark energy: investigation and modeling
• Early Dark Energy at High Redshifts: Status and Perspectives
• Constraining DGP Gravity from Observational Data
• Two Component Model of Dark Energy
• Constraints on oscillating dark energy models
• Observational constraints on a generalized equation of state model
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• A vacuum component of the Universe must evolve