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Cai, RG; Tuo, ZL; Tuo, ZL (reprint author), Chinese Acad Sci, Inst Theoret Phys, Key Lab Frontiers Theoret Phys, POB 2735, Beijing 100190, Peoples R China.
Detecting the cosmic acceleration with current data
Source PublicationPHYSICS LETTERS B
Language英语
KeywordProbe Wmap Observations Hubble-space-telescope Dark Energy Cosmological Constant Supernova Data Universe Redshift Expansion Lambda Rates
AbstractThe 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.
2011
ISSN0370-2693
Volume706Issue:41308Pages:116-122
Subject AreaPhysics
Indexed BySCI
Funding OrganizationNational Natural Science Foundation of China [10947203, 10821504, 10975168, 11035008, 11075098]; Ministry of Science and Technology of China [2010CB833004]; Chinese Academy of Sciences ; National Natural Science Foundation of China [10947203, 10821504, 10975168, 11035008, 11075098]; Ministry of Science and Technology of China [2010CB833004]; Chinese Academy of Sciences ; National Natural Science Foundation of China [10947203, 10821504, 10975168, 11035008, 11075098]; Ministry of Science and Technology of China [2010CB833004]; Chinese Academy of Sciences ; National Natural Science Foundation of China [10947203, 10821504, 10975168, 11035008, 11075098]; Ministry of Science and Technology of China [2010CB833004]; Chinese Academy of Sciences
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Cited Times:19[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.itp.ac.cn/handle/311006/14213
Collection理论物理所科研产出_SCI论文
Corresponding AuthorTuo, ZL (reprint author), Chinese Acad Sci, Inst Theoret Phys, Key Lab Frontiers Theoret Phys, POB 2735, Beijing 100190, Peoples R China.
Recommended Citation
GB/T 7714
Cai, RG,Tuo, ZL,Tuo, ZL . Detecting the cosmic acceleration with current data[J]. PHYSICS LETTERS B,2011,706(41308):116-122.
APA Cai, RG,Tuo, ZL,&Tuo, ZL .(2011).Detecting the cosmic acceleration with current data.PHYSICS LETTERS B,706(41308),116-122.
MLA Cai, RG,et al."Detecting the cosmic acceleration with current data".PHYSICS LETTERS B 706.41308(2011):116-122.
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