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Entropy and Gravity
Entropy 2013, 15(1), 156-161; doi:10.3390/e15010156
Article

The Thermal Entropy Density of Spacetime

1,2
1 College of Physical Science and Technology, Hebei University, Baoding 071002, China 2 Department of Physics, Tsinghua University, Beijing 100084, China 
Received: 28 November 2012 / Accepted: 25 December 2012 / Published: 8 January 2013
(This article belongs to the Special Issue Modified Gravity: From Black Holes Entropy to Current Cosmology)
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Abstract

Introducing the notion of thermal entropy density via the first law of thermodynamics and assuming the Einstein equation as an equation of thermal state, we obtain the thermal entropy density of any arbitrary spacetime without assuming a temperature or a horizon. The results confirm that there is a profound connection between gravity and thermodynamics.
Keywords: thermal entropy density; gravity; thermodynamics thermal entropy density; gravity; 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.

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Yang, R. The Thermal Entropy Density of Spacetime. Entropy 2013, 15, 156-161.

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