@inproceedings{oai:jaxa.repo.nii.ac.jp:00005071,
 author = {米徳, 大輔 and 村上, 敏夫 and 筒井, 亮 and 中村, 卓史 and 高橋, 慶太郎 and Yonetoku, Daisuke and Murakami, Toshio and Tsutsui, Ryo and Nakamura, Takashi and Takahashi, Keitaro},
 book = {宇宙航空研究開発機構特別資料:, JAXA Special Publication: The Energetic Cosmos; from Suzaku to ASTRO-H},
 month = {Feb},
 note = {The 3rd Suzaku international Conference "Energetic Cosmos : from Suzaku to ASTRO-H" (June 29-July 2, 2009. Grand Park Otaru Hotel), Otaru, Hokkaido Japan, We calibrated the peak energy-peak luminosity relation of GRBs (so called E(sub p) - L(sup p) ; Yonetoku relation) using 52 events with the redshift z < 1.755 without assuming any cosmological models. The luminosity distances to GRBs are estimated from those of large amount of Type Ia supernovae with z < 1.755. This calibrated E(sub p) - L(sup p) relation can be used as a new cosmic distance ladder toward higher redshifts. We determined the luminosity distances of 36 GRBs in 1.8 < z < 8.3 using the calibrated relation and plotted the likelihood contour in (omega(sub m), omega(sub lamda) plane. We obtained  (Omega(sub m), Omega(sub lamda) = (0.37(sup +0.14)(sub -0.11), 0.63(sup +0.11)(sub -0.14) for a flat universe. We can say that our universe in 1.8 < z < 8.3 is compatible with the cosmological model derived for z 1< 1.8. This suggests that the time variation of the dark energy may be small or zero up to z approximately 8., Meeting sponsors: The University of Tokyo, The Institute of Physical and Chemical Research, The Japan Society for the Promotion of Science, 資料番号: AA0064574139, レポート番号: JAXA-SP-09-008E},
 pages = {364--366},
 publisher = {宇宙航空研究開発機構, Japan Aerospace Exploration Agency (JAXA)},
 title = {The dark energy measurement in the early universe with Gamma-Ray Bursts},
 volume = {JAXA-SP-09-008E},
 year = {2010}
}