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题名: The distinctions between Lambda CDM and f(T) gravity according to Noether symmetry
作者: Dong, H ;  Wang, JX ;  Meng, XH
刊名: EUROPEAN PHYSICAL JOURNAL C
出版日期: 2013
卷号: 73, 期号:8, 页码:2543
关键词: BARYON ACOUSTIC-OSCILLATIONS ;  DARK-ENERGY ;  BIRKHOFFS-THEOREM ;  QUANTUM COSMOLOGY ;  CONSTRAINTS ;  CONSTANT ;  DYNAMICS ;  HISTORY ;  MODELS ;  SAMPLE
学科分类: Physics
通讯作者: Dong, H (reprint author), Nankai Univ, Dept Phys, Tianjin 300071, Peoples R China.
部门归属: [Dong, Han; Wang, Jiaxin; Meng, Xinhe] Nankai Univ, Dept Phys, Tianjin 300071, Peoples R China; [Meng, Xinhe] Chinese Acad Sci, Kavli Inst Theoret Phys China, Beijing 100190, Peoples R China
英文摘要: Noether's theory offers us a useful tool to research the conserved quantities and symmetries of the modified gravity theories, among which the f(T) theory, a generally modified teleparallel gravity, has been proposed to account for the dark energy phenomena. By the Noether symmetry approach, we investigate the power-law, exponential and polynomial forms of f (T) theories. All forms of f (T) concerned in this work possess the time translational symmetry, which is related with energy condition or Hamilton constraint. In addition, we find that the performances of the power-law and exponential forms are not pleasing. It is rational adding a linear term T to T-n as the most efficient amendment to resemble the teleparallel gravity or General Relativity on small scales, i.e., the scale of the solar system. The corresponding Noether symmetry indicates that only time translational symmetry remains. Through numerically calculations and observational data-sets constraining, the optimal form alpha T + beta T-1 is obtained, whose cosmological solution resembles the standard Lambda CDM best with lightly reduced cosmic age which can be alleviated by introducing another T-m term. More important is that we find the significant differences between Lambda CDM and f (T) gravity. The Lambda CDM model has also two additional symmetries and corresponding positive conserved quantities, except the two negative conserved quantities.
资助者: National Natural Science Foundation of China [11075078, 10675062]; Chinese Academy of Sciences (CAS) through the KITPC [KJCX2.YW.W10]
收录类别: SCI
原文出处: 查看原文
语种: 英语
WOS记录号: WOS:000323901300032
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/15303
Appears in Collections:理论物理所2013年知识产出 _期刊论文

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Recommended Citation:
Dong, H,Wang, JX,Meng, XH. The distinctions between Lambda CDM and f(T) gravity according to Noether symmetry[J]. EUROPEAN PHYSICAL JOURNAL C,2013,73(8):2543.
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