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Cosmological models with Lagrange multiplier field
Gao, Changjun1,2; Gong, Yan1,3; Wang, Xin1,3; Chen, Xuelei1,2,4
Source PublicationPHYSICS LETTERS B
AbstractWe first consider the Einstein-aether theory with a gravitational coupling and a Lagrange multiplier field, and then consider the non-minimally coupled quintessence field theory with Lagrange multiplier field. We study the influence of the Lagrange multiplier field on these models. We show that the energy density evolution of the Einstein-aether field and the quintessence field are significantly modified. The energy density of the Einstein-aether is nearly a constant during the entire history of the Universe. The energy density of the quintessence field can also be kept nearly constant in the matter dominated Universe, or even exhibit a phantom-like behavior for some models. This suggests a possible dynamical origin of the cosmological constant or dark energy. Further more, for the canonical quintessence in the absence of gravitational coupling, we find that the quintessence scalar field can play the role of cold dark matter with the introduction of a Lagrange multiplier field. We conclude that the Lagrange multiplier field could play a very interesting and important role in the construction of cosmological models. (C) 2011 Elsevier B.V. All rights reserved.
KeywordLagrange Multiplier Einstein-aether Theory Quintessence Dark Energy Dark Matter
Indexed BySCI
WOS IDWOS:000293928600001
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Cited Times:24[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
2.Chinese Acad Sci, Kavli Inst Theoret Phys China, Beijing 100190, Peoples R China
3.Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China
4.Peking Univ, Ctr High Energy Phys, Beijing 100871, Peoples R China
Recommended Citation
GB/T 7714
Gao, Changjun,Gong, Yan,Wang, Xin,et al. Cosmological models with Lagrange multiplier field[J]. PHYSICS LETTERS B,2011,702(2-3):107-113.
APA Gao, Changjun,Gong, Yan,Wang, Xin,&Chen, Xuelei.(2011).Cosmological models with Lagrange multiplier field.PHYSICS LETTERS B,702(2-3),107-113.
MLA Gao, Changjun,et al."Cosmological models with Lagrange multiplier field".PHYSICS LETTERS B 702.2-3(2011):107-113.
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