Entropy 2012, 14(12), 2456-2477; doi:10.3390/e14122456
Article

Entropy and Gravity

Faculty of Technology, Art and Design, Oslo and Akershus University College of Applied Sciences, P. O. Box 4, St. Olavs Plass, N-0130 Oslo, Norway
Received: 26 October 2012; in revised form: 22 November 2012 / Accepted: 23 November 2012 / Published: 4 December 2012
(This article belongs to the Special Issue Modified Gravity: From Black Holes Entropy to Current Cosmology)
PDF Full-text Download PDF Full-Text [369 KB, Updated Version, uploaded 5 December 2012 15:21 CET]
The original version is still available [370 KB, uploaded 4 December 2012 09:18 CET]
Abstract: The effect of gravity upon changes of the entropy of a gravity-dominated system is discussed. In a universe dominated by vacuum energy, gravity is repulsive, and there is accelerated expansion. Furthermore, inhomogeneities are inflated and the universe approaches a state of thermal equilibrium. The difference between the evolution of the cosmic entropy in a co-moving volume in an inflationary era with repulsive gravity and a matter-dominated era with attractive gravity is discussed. The significance of conversion of gravitational energy to thermal energy in a process with gravitational clumping, in order that the entropy of the universe shall increase, is made clear. Entropy of black holes and cosmic horizons are considered. The contribution to the gravitational entropy according to the Weyl curvature hypothesis is discussed. The entropy history of the Universe is reviewed.
Keywords: entropy; gravity; gravitational contraction; cosmological constant; black hole; horizon; Weyl curvature hypothesis; inflationary era

Article Statistics

Load and display the download statistics.

Citations to this Article

Cite This Article

MDPI and ACS Style

Grøn, Ø. Entropy and Gravity. Entropy 2012, 14, 2456-2477.

AMA Style

Grøn Ø. Entropy and Gravity. Entropy. 2012; 14(12):2456-2477.

Chicago/Turabian Style

Grøn, Øyvind. 2012. "Entropy and Gravity." Entropy 14, no. 12: 2456-2477.

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