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
Entropy 2012, 14(12), 2456-2477; https://doi.org/10.3390/e14122456
Received: 26 October 2012 / Revised: 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)
AbstractThe 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. View Full-Text
Keywords: entropy; gravity; gravitational contraction; cosmological constant; black hole; horizon; Weyl curvature hypothesis; inflationary era►▼ Figures
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
Share & Cite This Article
MDPI and ACS Style
Grøn, Ø. Entropy and Gravity. Entropy 2012, 14, 2456-2477.
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.
Find Other Styles
For more information on the journal statistics, click here. Multiple requests from the same IP address are counted as one view.