Wang, Taishan 2009 用伽马暴限制Cardassian宇宙学模型

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Title:		Constraints on Cardassian universe from Gamma ray bursts
Authors:		Wang, Taishan; Liang, Nan
Affiliation:		AA(Department of Physics & Center for Astrophysics, Tsinghua University), AB(Department of Astronomy, Beijing Normal University)
Publication:		Science China Physics, Mechanics and Astronomy, Volume 53, Issue 9, pp.1720-1725 (ScChG Homepage)
Publication Date:		09/2010
Origin:		SPRINGER
Keywords:		Cardassian, Gamma ray burst, Cosmic Microwave Background, baryonic acoustic oscillation
Abstract Copyright:		(c) 2010: Science China Press and Springer-Verlag Berlin Heidelberg
DOI:		10.1007/s11433-010-4100-4
Bibliographic Code:		2010ScChG..53.1720W

Abstract

Constraints on the original Cardassian model and the modified polytropic Cardassian model are examined from the recently derived 42 gamma-ray bursts (GRBs) data calibrated with the method that can avoid the circularity problem. The results show that GRBs can be an optional observation to constrain the Cardassian models. Combining the GRBs data with the newly derived size of baryonic acoustic oscillation peak from the Sloan Digital Sky Survey (SDSS), and the position of the first acoustic peak of the Cosmic Microwave Background radiation (CMB) from Wilkinson Microwave Anisotropy Probe (WMAP), we find Ω _mo = 0.27{_‑0.02/^+0.02}, n = 0.06{_‑0.08/^+0.07} (1σ for the original Cardassian model, and Ω _mo = 0.27{_‑0.02/^+0.03}, n = ‑0.09{_‑1.91/^+0.23} β = 0.82{_‑0.62/^+2.10} (1 σ) for the modified polytropic Cardassian model.

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