Probing dark energy with gamma-ray bursts

Details Probing dark energy with gamma-ray bursts Probing dark energy with gamma-ray bursts

2003-05-15

arxiv.org/abs/astro-ph/0305260v2

Astronomy and Astrophysics

Astrophysics

4 pages, 6 figures, corrected some typos

Scientific paper

We propose a new method to use gamma-ray bursts (GRBs) as an alternative probe of the dark energy. By calibrating luminosity-variability and luminosity-lag time relations at low redshift where distance-redshift relations have been already determined from type Ia supernova (SNIa), GRBs at high redshift can be used as a distance indicator. We investigate the potential impact of future GRB data on determining the current matter density $\Omega_{m}$ and the dark energy equation of state $w$ which is assumed to be constant. We show that a combined analysis of a data set expected from the {\it Swift} and the current SNIa data results in excellent determination of both $\Omega_{m}$ and $w$.

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