Cyclic cosmology from Lagrange-multiplier modified gravity

	Cyclic cosmology from Lagrange-multiplier modified gravity
	Cai YF(蔡一夫); Cai, YF; Saridakis, EN
刊名	CLASSICAL AND QUANTUM GRAVITY
	2011
卷号	28 期号:3 页码:35010
通讯作者	[Cai, Yi-Fu] Arizona State Univ, Dept Phys, Tempe, AZ 85287 USA ; [Cai, Yi-Fu] Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China ; [Saridakis, Emmanuel N.] Chongqing Univ Posts & Telecommun, Coll Math & Phys, Chongqing 400065, Peoples R China
英文摘要	We investigate cyclic and singularity-free evolutions in a universe governed by Lagrange-multiplier modified gravity, in both scalar-field cosmology and the f(R) one. In the scalar case, cyclicity can be induced by a suitably reconstructed simple potential, and the matter content of the Universe can be successfully incorporated. In the case of f(R)-gravity, cyclicity can be induced by a suitably reconstructed second function f(2)(R) of a very simple form; however, the matter evolution cannot be analytically handled. Furthermore, we study the evolution of cosmological perturbations for the two scenarios. For the scalar case the system possesses no wavelike modes due to a dust-like sound speed, while for the f(R) case there exists an oscillation mode of perturbations which indicates a dynamical degree of freedom. Both scenarios allow for stable parameter spaces of cosmological perturbations through the bouncing point.
学科主题	Astronomy & Astrophysics; Physics
类目[WOS]	Astronomy & Astrophysics ; Physics, Multidisciplinary ; Physics, Particles & Fields
研究领域[WOS]	Astronomy & Astrophysics ; Physics
原文出处	SCI
语种	英语
WOS记录号	WOS:000286222600012
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/240579]
专题	高能物理研究所_理论物理室
作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	Cai YF,Cai, YF,Saridakis, EN. Cyclic cosmology from Lagrange-multiplier modified gravity[J]. CLASSICAL AND QUANTUM GRAVITY,2011,28(3):35010.
APA	蔡一夫,Cai, YF,&Saridakis, EN.(2011).Cyclic cosmology from Lagrange-multiplier modified gravity.CLASSICAL AND QUANTUM GRAVITY,28(3),35010.
MLA	蔡一夫,et al."Cyclic cosmology from Lagrange-multiplier modified gravity".CLASSICAL AND QUANTUM GRAVITY 28.3(2011):35010.