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Cyclic cosmology from Lagrange-multiplier modified gravity
Cai YF(蔡一夫); Cai, YF; Saridakis, EN
2011
发表期刊CLASSICAL AND QUANTUM GRAVITY
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
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.
文章类型Article
学科领域Astronomy & Astrophysics; Physics
研究领域[WOS]Astronomy & Astrophysics ; Physics
DOI10.1088/0264-9381/28/3/035010
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语种英语
WOS类目Astronomy & Astrophysics ; Physics, Multidisciplinary ; Physics, Particles & Fields
WOS记录号WOS:000286222600012
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被引频次:42[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/240579
专题理论物理室
作者单位中国科学院高能物理研究所
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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.
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