dc.contributor.author | Elgarøy, Øystein | en_US |
dc.contributor.author | Grøn, Øyvind | en_US |
dc.date.accessioned | 2014-01-24T11:17:03Z | |
dc.date.available | 2014-01-24T11:17:03Z | |
dc.date.issued | 2013-09-04 | en_US |
dc.identifier.citation | Elgarøy, Ø., & Grøn, Ø. (2013). Gravitational Entropy and Inflation. Entropy, 15(9), 3620-3639. | en_US |
dc.identifier.issn | 1099-4300 | en_US |
dc.identifier.other | FRIDAID 1047335 | en_US |
dc.identifier.uri | https://hdl.handle.net/10642/1789 | |
dc.description.abstract | The main topic of this paper is a description of the generation of entropy at
the end of the inflationary era. As a generalization of the present standard model of the
Universe dominated by pressureless dust and a Lorentz invariant vacuum energy (LIVE), we
first present a flat Friedmann universe model, where the dust is replaced with an ideal gas. It
is shown that the pressure of the gas is inversely proportional to the fifth power of the scale
factor and that the entropy in a comoving volume does not change during the expansion.
We then review different measures of gravitational entropy related to the Weyl curvature
conjecture and calculate the time evolution of two proposed measures of gravitational
entropy in a LIVE-dominated Bianchi type I universe, and a Lemaitre-Bondi-Tolman
universe with LIVE. Finally, we elaborate upon a model of energy transition from vacuum
energy to radiation energy, that of Bonanno and Reuter, and calculate the time evolution of
the entropies of vacuum energy and radiation energy. We also calculate the evolution of the
maximal entropy according to some recipes and demonstrate how a gap between the maximal
entropy and the actual entropy opens up at the end of the inflationary era. | en_US |
dc.language.iso | eng | en_US |
dc.publisher | MDPI | en_US |
dc.relation.ispartofseries | Entropy;15 (9) | en_US |
dc.subject | Arrow of time | en_US |
dc.subject | Inflation | en_US |
dc.subject | Gravitational entropy | en_US |
dc.subject | VDP::Matematikk og Naturvitenskap: 400::Fysikk: 430::Astrofysikk, astronomi: 438 | en_US |
dc.title | Gravitational Entropy and Inflation | en_US |
dc.type | Journal article | en_US |
dc.type | Peer reviewed | en_US |
dc.description.version | © 2013 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article
distributed under the terms and conditions of the Creative Commons Attribution license
(http://creativecommons.org/licenses/by/3.0/). | en_US |
dc.identifier.doi | http://dx.doi.org/10.3390/e15093620 | |