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

The Thermal Entropy Density of Spacetime

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)
PDF Full-text Download PDF Full-Text [147 KB, uploaded 8 January 2013 10:47 CET]
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

Article Statistics

Load and display the download statistics.

Citations to this Article

Cite This Article

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.

Entropy EISSN 1099-4300 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert