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Entropy 2010, 12(4), 932-952; doi:10.3390/e12040932

Entropy in the Present and Early Universe: New Small Parameters and Dark Energy Problem

National Centre for Particle and High Energy Physics, Bogdanovich Street 153, Minsk 220040, Belarus
Received: 22 March 2010 / Revised: 7 April 2010 / Accepted: 10 April 2010 / Published: 14 April 2010
(This article belongs to the Special Issue Feature Papers: Entropy Concepts and Applications)
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It is demonstrated that entropy and its density play a significant role in solving the problem of the vacuum energy density (cosmological constant) of the Universe and hence the dark energy problem. Taking this in mind, two most popular models for dark energy—Holographic Dark Energy Model and Agegraphic Dark Energy Model—are analysed. It is shown that the fundamental quantities in the first of these models may be expressed in terms of a new small dimensionless parameter that is naturally occurring in High Energy Gravitational Thermodynamics and Gravitational Holography (UV-limit). On this basis, the possibility of a new approach to the problem of Quantum Gravity is discussed. Besides, the results obtained on the uncertainty relation of the pair “cosmological constant–volume of space-time”, where the cosmological constant is a dynamic quantity, are reconsidered and generalized up to the Generalized Uncertainty Relation.
Keywords: dark energy; deformed quantum theory; new small parameters dark energy; deformed quantum theory; new small parameters
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Shalyt-Margolin, A. Entropy in the Present and Early Universe: New Small Parameters and Dark Energy Problem. Entropy 2010, 12, 932-952.

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