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Entropy 2011, 13(1), 274-292;

Entropy Production during Asymptotically Safe Inflation

INAF-Catania Astrophysical Observatory,Via S.Sofia 78, 95123 Catania, Italy
INFN, Via S.Sofia 64, 95123 Catania, Italy
Institute of Physics, University of Mainz, Staudingerweg 7, D-55099 Mainz, Germany
Author to whom correspondence should be addressed.
Received: 10 December 2010 / Revised: 5 January 2011 / Accepted: 5 January 2011 / Published: 24 January 2011
(This article belongs to the Special Issue Entropy in Quantum Gravity)
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The Asymptotic Safety scenario predicts that the deep ultraviolet of Quantum Einstein Gravity is governed by a nontrivial renormalization group fixed point. Analyzing its implications for cosmology using renormalization group improved Einstein equations, we find that it can give rise to a phase of inflationary expansion in the early Universe. Inflation is a pure quantum effect here and requires no inflaton field. It is driven by the cosmological constant and ends automatically when the renormalization group evolution has reduced the vacuum energy to the level of the matter energy density. The quantum gravity effects also provide a natural mechanism for the generation of entropy. It could easily account for the entire entropy of the present Universe in the massless sector. View Full-Text
Keywords: quantum gravity; Asymptotic Safety; inflation quantum gravity; Asymptotic Safety; inflation

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This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Bonanno, A.; Reuter, M. Entropy Production during Asymptotically Safe Inflation. Entropy 2011, 13, 274-292.

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