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

The Thermal Entropy Density of Spacetime

Rongjia Yang 1,2 email
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

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MDPI and ACS Style

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

AMA Style

Yang R. The Thermal Entropy Density of Spacetime. Entropy. 2013; 15(1):156-161.

Chicago/Turabian Style

Yang, Rongjia. 2013. "The Thermal Entropy Density of Spacetime." Entropy 15, no. 1: 156-161.

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