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Xu, LX; Xu, LX (reprint author), Dalian Univ Technol, Inst Theoret Phys Dalian, Dalian 116024, Peoples R China.
A New Unified Dark Fluid Model and Its Cosmic Constraint
Source PublicationINTERNATIONAL JOURNAL OF THEORETICAL PHYSICS
Language英语
KeywordModified Chaplygin-gas Monte-carlo Approach Cosmological Constant Energy Universe Matter
AbstractIn 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.
2014
ISSN0020-7748
Volume53Issue:11Pages:4025-4034
Subject AreaPhysics
DOI10.1007/s10773-014-2153-2
Indexed BySCI
Funding OrganizationFundamental 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]
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Document Type期刊论文
Identifierhttp://ir.itp.ac.cn/handle/311006/15595
Collection理论物理所科研产出_SCI论文
Corresponding AuthorXu, LX (reprint author), Dalian Univ Technol, Inst Theoret Phys Dalian, Dalian 116024, Peoples R China.
Recommended Citation
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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