Entropy 2011, 13(5), 936-948; doi:10.3390/e13050936
Article

Is Gravity an Entropic Force?

Received: 2 March 2011; in revised form: 7 April 2011 / Accepted: 24 April 2011 / Published: 28 April 2011
(This article belongs to the Special Issue Black Hole Thermodynamics)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: 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.
Keywords: gravity; thermodynamics; entropic force; discrete spacetime
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MDPI and ACS Style

Gao, S. Is Gravity an Entropic Force? Entropy 2011, 13, 936-948.

AMA Style

Gao S. Is Gravity an Entropic Force? Entropy. 2011; 13(5):936-948.

Chicago/Turabian Style

Gao, Shan. 2011. "Is Gravity an Entropic Force?" Entropy 13, no. 5: 936-948.

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