We formed a GRB cosmology project in Japan, and promote the observational cosmology with Gamma‐ray bursts (GRBs). In this paper, we introduce recent result of our project with the spectral ‐Luminosity relations. We show the Hubble diagram up to the redshift of and the confidence contour of the dark energy and the dark matter beyond z>2 beyond the current range measured by the Type Ia supernovae. After that, we investigate the origin of data dispersion of the Epeak‐brightness relations, and suggest a possible improvement of their accuracy.
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© 2010 American Institute of Physics.
2010
American Institute of Physics
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