Detecting the cosmic acceleration with current data

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	Detecting the cosmic acceleration with current data
	Cai, RG
刊名	PHYSICS LETTERS B
	2011
卷号	706 期号:41308 页码:116-122
关键词	PROBE WMAP OBSERVATIONS HUBBLE-SPACE-TELESCOPE DARK ENERGY COSMOLOGICAL CONSTANT SUPERNOVA DATA UNIVERSE REDSHIFT EXPANSION LAMBDA RATES
ISSN号	0370-2693
通讯作者	Tuo, ZL (reprint author), Chinese Acad Sci, Inst Theoret Phys, Key Lab Frontiers Theoret Phys, POB 2735, Beijing 100190, Peoples R China.
英文摘要	The deceleration parameter q as the diagnostic of the cosmological accelerating expansion is investigated. By expanding the luminosity distance to the fourth order of redshift and the so-called y-redshift in two redshift bins and fitting the SNla data (Union2), the marginalized likelihood distribution of the current deceleration parameter shows that the cosmic acceleration is still increasing, but there might be a tendency that the cosmic acceleration will slow down in the near future. We also fit the Hubble evolution data together with SNla data by expanding the Hubble parameter to the third order, showing that the present decelerating expansion is excluded within 2 sigma error. Further exploration on this problem is also approached in a non-parametrization method by directly reconstructing the deceleration parameter from the distance modulus of SNla, which depends neither on the validity of general relativity nor on the content of the universe or any assumption regarding cosmological parameters. More accurate observation datasets and more effective methods are still in need to make a clear answer on whether the cosmic acceleration will keep increasing or not. Crown Copyright (C) 2011 Published by Elsevier B.V. All rights reserved.
学科主题	Physics
收录类别	SCI
资助信息	National Natural Science Foundation of China [10947203, 10821504, 10975168, 11035008, 11075098]; Ministry of Science and Technology of China [2010CB833004]; Chinese Academy of Sciences
原文出处	http://dx.doi.org/10.1016/j.physletb.2011.11.021
语种	英语
WOS记录号	WOS:000298338000002
公开日期	2013-05-17
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/14213]
专题	理论物理研究所_理论物理所1978-2010年知识产出
推荐引用方式 GB/T 7714	Cai, RG. Detecting the cosmic acceleration with current data[J]. PHYSICS LETTERS B,2011,706(41308):116-122.
APA	Cai, RG.(2011).Detecting the cosmic acceleration with current data.PHYSICS LETTERS B,706(41308),116-122.
MLA	Cai, RG."Detecting the cosmic acceleration with current data".PHYSICS LETTERS B 706.41308(2011):116-122.