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A New Unified Dark Fluid Model and Its Cosmic Constraint
Xu, LX; Xu, LX (reprint author), Dalian Univ Technol, Inst Theoret Phys Dalian, Dalian 116024, Peoples R China.
2014
发表期刊INTERNATIONAL JOURNAL OF THEORETICAL PHYSICS
ISSN0020-7748
卷号53期号:11页码:4025-4034
摘要In this paper, we propose a new unified dark fluid (UDF) model with equation of state (EoS) w(a) = -alpha/(beta a(-n) + 1), which includes the generalized Chaplygin gas model (gGg) as its special case, where alpha, beta and n are three positive numbers. It is clear that this model reduces to the gCg model with EoS w(a) = -B-s/(B-s + (1 - B-s)a(-3(1+ a))), when alpha = 1, beta = (1 -B-s) / B-s and n = 3(1 + alpha). By combination the cold dark matter and the cosmological constant, one can coin a EoS of unified dark fluid in the form of w(a) = -1/(1 + (1 - Omega(Lambda))a(-3)/Omega(Lambda)). With this observations, our proposed EoS provides a possible deviation from Lambda CDM model when the model parameters alpha and n deviate from 1 and 3 respectively. By using the currently available cosmic observations from type Ia supernovae (SN Ia) Union2.1, baryon acoustic oscillation (BAO) and cosmic microwave background radiation (CMB), we test the viability of this model and detect the possible devotion from the Lambda CDM model. The results show that the new UDF model fits the cosmic observation as well as that of the Lambda CDM model and no deviation is found from the Lambda CDM model in 3s confidence level. However, our new UDF model can give a non-zero sound speed, as a contrast, which is zero for the Lambda CDM model. We expect the large structure formation information can distinct the new UDF model from the Lambda CDM model.
部门归属[Xu, Lixin] Dalian Univ Technol, Inst Theoret Phys Dalian, Dalian 116024, Peoples R China ; [Xu, Lixin] Chinese Acad Sci, Inst Theoret Phys, State Key Lab Theoret Phys, Beijing 100190, Peoples R China
关键词Modified Chaplygin-gas Monte-carlo Approach Cosmological Constant Energy Universe Matter
学科领域Physics
资助者Fundamental Research Funds for the Central Universities [DUT11LK39]; NSFC [11275035] ; Fundamental Research Funds for the Central Universities [DUT11LK39]; NSFC [11275035] ; Fundamental Research Funds for the Central Universities [DUT11LK39]; NSFC [11275035] ; Fundamental Research Funds for the Central Universities [DUT11LK39]; NSFC [11275035] ; Fundamental Research Funds for the Central Universities [DUT11LK39]; NSFC [11275035] ; Fundamental Research Funds for the Central Universities [DUT11LK39]; NSFC [11275035] ; Fundamental Research Funds for the Central Universities [DUT11LK39]; NSFC [11275035] ; Fundamental Research Funds for the Central Universities [DUT11LK39]; NSFC [11275035]
DOI10.1007/s10773-014-2153-2
URL查看原文
收录类别SCI
语种英语
资助者Fundamental Research Funds for the Central Universities [DUT11LK39]; NSFC [11275035] ; Fundamental Research Funds for the Central Universities [DUT11LK39]; NSFC [11275035] ; Fundamental Research Funds for the Central Universities [DUT11LK39]; NSFC [11275035] ; Fundamental Research Funds for the Central Universities [DUT11LK39]; NSFC [11275035] ; Fundamental Research Funds for the Central Universities [DUT11LK39]; NSFC [11275035] ; Fundamental Research Funds for the Central Universities [DUT11LK39]; NSFC [11275035] ; Fundamental Research Funds for the Central Universities [DUT11LK39]; NSFC [11275035] ; Fundamental Research Funds for the Central Universities [DUT11LK39]; NSFC [11275035]
WOS记录号WOS:000343288900032
引用统计
文献类型期刊论文
条目标识符http://ir.itp.ac.cn/handle/311006/15595
专题理论物理所SCI论文
通讯作者Xu, LX (reprint author), Dalian Univ Technol, Inst Theoret Phys Dalian, Dalian 116024, Peoples R China.
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GB/T 7714
Xu, LX,Xu, LX . A New Unified Dark Fluid Model and Its Cosmic Constraint[J]. INTERNATIONAL JOURNAL OF THEORETICAL PHYSICS,2014,53(11):4025-4034.
APA Xu, LX,&Xu, LX .(2014).A New Unified Dark Fluid Model and Its Cosmic Constraint.INTERNATIONAL JOURNAL OF THEORETICAL PHYSICS,53(11),4025-4034.
MLA Xu, LX,et al."A New Unified Dark Fluid Model and Its Cosmic Constraint".INTERNATIONAL JOURNAL OF THEORETICAL PHYSICS 53.11(2014):4025-4034.
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