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Dong, H; Wang, JX; Meng, XH; Dong, H (reprint author), Nankai Univ, Dept Phys, Tianjin 300071, Peoples R China.
The distinctions between Lambda CDM and f(T) gravity according to Noether symmetry
Source PublicationEUROPEAN PHYSICAL JOURNAL C
Language英语
KeywordBaryon Acoustic-oscillations Dark-energy Birkhoffs-theorem Quantum Cosmology Constraints Constant Dynamics History Models Sample
AbstractNoether'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.
2013
ISSN1434-6044
Volume73Issue:8Pages:2543
Subject AreaPhysics
Indexed BySCI
Funding OrganizationNational Natural Science Foundation of China [11075078, 10675062]; Chinese Academy of Sciences (CAS) through the KITPC [KJCX2.YW.W10] ; National Natural Science Foundation of China [11075078, 10675062]; Chinese Academy of Sciences (CAS) through the KITPC [KJCX2.YW.W10] ; National Natural Science Foundation of China [11075078, 10675062]; Chinese Academy of Sciences (CAS) through the KITPC [KJCX2.YW.W10] ; National Natural Science Foundation of China [11075078, 10675062]; Chinese Academy of Sciences (CAS) through the KITPC [KJCX2.YW.W10]
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Document Type期刊论文
Identifierhttp://ir.itp.ac.cn/handle/311006/15303
Collection理论物理所科研产出_SCI论文
Corresponding AuthorDong, H (reprint author), Nankai Univ, Dept Phys, Tianjin 300071, Peoples R China.
Recommended Citation
GB/T 7714
Dong, H,Wang, JX,Meng, XH,et al. 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,&Dong, H .(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.
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