Is Gravity an Entropic Force?

Citation data:

Entropy, ISSN: 1099-4300, Vol: 13, Issue: 5, Page: 936-948

Publication Year:
Usage 493
Downloads 386
Abstract Views 64
Full Text Views 43
Captures 8
Exports-Saves 8
Social Media 24
Shares, Likes & Comments 22
Tweets 2
Citations 18
Citation Indexes 18
Repository URL:
Gao, Shan
Physics and Astronomy
Most Recent Tweet View All Tweets
article description
The remarkable connections between gravity and thermodynamics seem to imply that gravity is not fundamental but emergent, and in particular, as Verlinde suggested, gravity is probably an entropic force. In this paper, we will argue that the idea of gravity as an entropic force is debatable. It is shown that there is no convincing analogy between gravity and entropic force in Verlinde's example. Neither holographic screen nor test particle satisfies all requirements for the existence of entropic force in a thermodynamics system. Furthermore, we show that the entropy increase of the screen is not caused by its statistical tendency to increase entropy as required by the existence of entropic force, but in fact caused by gravity. Therefore, Verlinde's argument for the entropic origin of gravity is problematic. In addition, we argue that the existence of a minimum size of spacetime, together with the Heisenberg uncertainty principle in quantum theory, may imply the fundamental existence of gravity as a geometric property of spacetime. This may provide a further support for the conclusion that gravity is not an entropic force. © 2011 by the authors; licensee MDPI, Basel, Switzerland.