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题名: Detecting the cosmic acceleration with current data
作者: Cai, RG ;  Tuo, ZL
刊名: PHYSICS LETTERS B
出版日期: 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
学科分类: Physics
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.
部门归属: [Cai, Rong-Gen; Tuo, Zhong-Liang] Chinese Acad Sci, Inst Theoret Phys, Key Lab Frontiers Theoret Phys, 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.
资助者: National Natural Science Foundation of China [10947203, 10821504, 10975168, 11035008, 11075098]; Ministry of Science and Technology of China [2010CB833004]; Chinese Academy of Sciences
收录类别: SCI
原文出处: 查看原文
语种: 英语
WOS记录号: WOS:000298338000002
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/14213
Appears in Collections:理论物理所2011年知识产出_期刊论文

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Recommended Citation:
Cai, RG,Tuo, ZL. Detecting the cosmic acceleration with current data[J]. PHYSICS LETTERS B,2011,706(41308):116-122.
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