The distinctions between Lambda CDM and f(T) gravity according to Noether symmetry

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	The distinctions between Lambda CDM and f(T) gravity according to Noether symmetry
	Dong, H ; Wang, JX ; Meng, XH
刊名	EUROPEAN PHYSICAL JOURNAL C
	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
ISSN号	1434-6044
通讯作者	Dong, H (reprint author), Nankai Univ, Dept Phys, Tianjin 300071, 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.
学科主题	Physics
收录类别	SCI
资助信息	National Natural Science Foundation of China [11075078, 10675062]; Chinese Academy of Sciences (CAS) through the KITPC [KJCX2.YW.W10]
原文出处	http://dx.doi.org/10.1140/epjc/s10052-013-2543-2
语种	英语
WOS记录号	WOS:000323901300032
公开日期	2014-04-25
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/15303]
专题	理论物理研究所_理论物理所1978-2010年知识产出
推荐引用方式 GB/T 7714	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.
APA	Dong, H,Wang, JX,&Meng, XH.(2013).The distinctions between Lambda CDM and f(T) gravity according to Noether symmetry.EUROPEAN PHYSICAL JOURNAL C,73(8),2543.
MLA	Dong, H,et al."The distinctions between Lambda CDM and f(T) gravity according to Noether symmetry".EUROPEAN PHYSICAL JOURNAL C 73.8(2013):2543.