Latest cosmological constraints on Cardassian expansion models including the updated gamma-ray bursts

• Published in: Research in astronomy and astrophysics Vol. 11; no. 9; pp. 1019 - 1030
• Main Authors: Liang, Nan, Wu, Pu-Xun, Zhu, Zong-Hong
• Format: Journal Article
• Language: English
• Published: IOP Publishing 01.09.2011; zhuzh@bnu.edu.cn; wpx0227@gmail.com%Department of Astronomy, Beijing Normal University, Beijing 100875, Chinaliangn@bnu.edu.cn; Department of Astronomy, Beijing Normal University, Beijing 100875, Chinaliangn@bnu.edu.cn; Center for High Energy Physics, Peking University, Beijing 100871, China%Center of Nonlinear Science and Department of Physics, Ningbo University, Ningbo 315211,China
• Subjects: DM模型; Ia型超新星; 伽玛射线爆发; 威尔金森微波各向异性探测器; 宇宙微波背景辐射; 宇宙观; 扩张模; 观测数据; gamma-rays; bursts - cosmology; cosmological parameters
• ISSN: 1674-4527; 2397-6209; 2397-6209
• DOI: 10.1088/1674-4527/11/9/002

Abstract We constrain the Cardassian expansion models from the latest observa- tions, including the updated Gamma-ray bursts （GRBs）, which are calibrated using a cosmology independent method from the Union2 compilation of type Ia supernovae （SNe Ia）. By combining the GRB data with the joint observations from the Union2 SNe Ia set, along with the results from the Cosmic Microwave Background radia- tion observation from the seven-year Wilkinson Microwave Anisotropy Probe and the baryonic acoustic oscillation observation galaxy sample from the spectroscopic Sloan Digital Sky Survey Data Release. we find significant constraints on the model oarameters of the original Cardassian model ΩM0=0.282-0.014^0.015,n=0.03-0.05^＋0.05 and n=-0.16-3.26^＋0.25,β=0.76-0.58^＋0.34 of the modified polytropic Cardassian model, which are consistent with the ACDM model in a l-or confidence region. From the reconstruction of the deceleration parameter q（z） in Cardassian models, we obtain the transition redshift ZT = 0.73 ± 0.04 for the original Cardassian model and ZT = 0.68 ± 0.04 for the modified polytropic Cardassian model.