Quintom cosmology: Theoretical implications and observations

	Quintom cosmology: Theoretical implications and observations
	Cai YF(蔡一夫); Cai, YF; Saridakis, EN; Setare, MR; Xia, JQ
刊名	PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS
	2010
卷号	493 期号:1 页码:1-60
关键词	Dark energy Quintom scenario Null energy condition Bouncing cosmology
通讯作者	Saridakis, EN (reprint author), Univ Athens, Dept Phys, GR-15771 Athens, Greece.
英文摘要	We review the paradigm of quintom cosmology. This scenario is motivated by the observational indications that the equation-of-state of dark energy across the cosmological constant boundary is mildly favored, although the data are still far from being conclusive. As a theoretical setup we introduce a no-go theorem existing in quintom cosmology, and based on it we discuss the conditions for the equation-of-state of dark energy realizing the quintom scenario. The simplest quintom model can be achieved by introducing two scalar fields with one being quintessence and the other phantom. Based on the double-field quintom model we perform a detailed analysis of dark energy perturbations and we discuss their effects on current observations. This type of scenario usually suffers from a manifest problem due to the existence of a ghost degree-of-freedom, and thus we review various alternative realizations of the quintom paradigm. The developments in particle physics and string theory provide potential clues indicating that a quintom scenario may be obtained from scalar systems with higher derivative terms, as well as from non-scalar systems. Additionally, we construct a quintom realization in the framework of braneworld cosmology, where the cosmic acceleration and the phantom divide crossing result from the combined effects of the field evolution on the brane and the competition between four- and five-dimensional gravity. Finally, we study the outsets and fates of a universe in quintom cosmology. In a scenario with null energy condition violation one may obtain a bouncing solution at early times and therefore avoid the Big Bang singularity. Furthermore, if this occurs periodically, we obtain a realization of an oscillating universe. Lastly, we comment on several open issues in quintom cosmology and their connection to future investigations. (C) 2010 Elsevier B.V. All rights reserved.
学科主题	Physics
类目[WOS]	Physics, Multidisciplinary
收录类别	SCI
WOS记录号	WOS:000280947700001
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/225418]
专题	高能物理研究所_理论物理室
推荐引用方式 GB/T 7714	Cai YF,Cai, YF,Saridakis, EN,et al. Quintom cosmology: Theoretical implications and observations[J]. PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS,2010,493(1):1-60.
APA	蔡一夫,Cai, YF,Saridakis, EN,Setare, MR,&Xia, JQ.(2010).Quintom cosmology: Theoretical implications and observations.PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS,493(1),1-60.
MLA	蔡一夫,et al."Quintom cosmology: Theoretical implications and observations".PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS 493.1(2010):1-60.