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arXiv 1001.4585hep-thastro-ph.COgr-qc
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修正熵力

Modified Entropic Force

Changjun Gao

摘要:

统计热力学理论告诉我们,能量均分定律在极低的温度范围内是不成立的。发现德拜模型对大多数固体的实验结果都能很好地解释。基于这一事实,我们修正了最近提出的熵力公式。由于Unruh温度与引力场的强度成正比,所以修正的熵力公式是牛顿引力公式在弱场的推广。相反,广义相对论将牛顿引力理论推广到强场情形。对应于德拜温度,存在德拜加速度g_D。得到德拜加速度g_D=10^{-15}N kg^{-1}。这个加速度比海王星感受到的10^{-4}N kg^{-1}和太阳感受到的10^{-10}N kg^{-1}小得多。因此,在太阳系和银河系中,修正的熵力可以用牛顿引力很好地近似。有了这个德拜加速,我们发现当前的宇宙加速可以在不调用任何类型的暗能量的情况下得到解释。

英文摘要:

The theory of statistical thermodynamics tells us the equipartition law of energy does not hold in the limit of very low temperatures. It is found the Debye model is very successful in explaining the experimental results for most of the solid objects. Motivated by this fact, we modify the entropic force formula which is proposed very recently. Since the Unruh temperature is proportional to the strength of gravitational field, so the modified entropic force formula is an extension of the Newtonian gravity to weak field. On the contrary, General Relativity extends Newtonian gravity to strong field case. Corresponding to Debye temperature, there exists a Debye acceleration g_D. It is found the Debye acceleration is g_D=10^{-15}N kg^{-1}. This acceleration is very much smaller than the gravitational acceleration 10^{-4}N kg^{-1} which is felt by the Neptune and the gravitational acceleration 10^{-10}N kg^{-1} felt by the Sun. Therefore, the modified entropic force can be very well approximated by the Newtonian gravity in the solar system and in the Galaxy. With this Debye acceleration, we find the current cosmic speeding up can be explained without invoking any kind of dark energy.

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