Unification of Dark Matter and Dark Energy in a Modified Entropic Force Model
Unification of Dark Matter and Dark Energy in a Modified Entropic Force Model
复制标题
修正熵力模型中暗物质和暗能量的统一
DOI:
10.1088/0253-6102/56/1/32
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发表时间:
2010-09
影响因子:
3.1
通讯作者:
Li Xin
中科院分区:
文献类型:
--
作者:
Chang Zhe;Li Ming-Hua;Li Xin
In Verlinde's entropic force scenario of gravity, Newton's laws and Einstein equations can be obtained from the first principles and general assumptions. However, the equipartition law of energy is invalid at very low temperatures. We show clearly that the threshold of the equipartition law of energy is related with horizon of the universe. Thus, a one-dimensional Debye (ODD) model in the direction of radius of the modified entropic force (MEF) may be suitable in description of the accelerated expanding universe. We present a Friedmann cosmic dynamical model in the ODD-MEF framework. We examine carefully constraints on the ODD-MEF model from the Union2 compilation of the Supernova Cosmology Project (SCP) collaboration, the data from the observation of the large-scale structure (LSS) and the cosmic microwave background (CMB), i.e. SNe Ia+LSS+CMB. The combined numerical analysis gives the best-fit value of the model parameters zeta similar or equal to 10(-9) and Omega(m0) = 0.224, with chi(2)(min) = 591.156. The corresponding age of the universe agrees with the result of D. Spergel et al. [J.M. Bardeen, B. Carter, and S.W. Hawking, Commun. Math. Phys. 31 (1973) 161] at 95% confidence level. The numerical result also yields an accelerated expanding universe without invoking any kind of dark energy. Taking zeta( 2 pi omega(D)/H-0) as a running parameter associated with the structure scale r, we obtain a possible unified scenario of the asymptotic flatness of the radial velocity dispersion of spiral galaxies, the accelerated expanding universe and the Pioneer 10/11 anomaly in the entropic force framework of Verlinde.
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影响因子:
5
作者:
J. Bekenstein
通讯作者:
J. Bekenstein
影响因子:
2.2
作者:
Fu-Wen Shu;Y. Gong
通讯作者:
Fu-Wen Shu;Y. Gong
DOI:
10.1086/158003
发表时间:
1980-06
期刊:
The Astrophysical Journal
影响因子:
--
作者:
V. Rubin;W. Ford;N. Thonnard
通讯作者:
V. Rubin;W. Ford;N. Thonnard
影响因子:
5.4
作者:
Cai, Rong-Gen;Cao, Li-Ming;Hu, Ya-Peng
通讯作者:
Hu, Ya-Peng
影响因子:
5
作者:
Cai, Rong-Gen;Cao, Li-Ming;Ohta, Nobuyoshi
通讯作者:
Ohta, Nobuyoshi