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The Thermal Entropy Density of Spacetime
College of Physical Science and Technology, Hebei University, Baoding 071002, China
Department of Physics, Tsinghua University, Beijing 100084, China
Received: 28 November 2012; Accepted: 25 December 2012 / Published: 8 January 2013
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.
Yang R. The Thermal Entropy Density of Spacetime. Entropy. 2013; 15(1):156-161.
Yang, Rongjia. 2013. "The Thermal Entropy Density of Spacetime." Entropy 15, no. 1: 156-161.