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Dark Energy: The Shadowy Reflection of Dark Matter?

Department of Mechanical Engineering, Technological Education Institute of Central Macedonia, Serres 621.24, Greece
Department of Astronomy, Aristoteleion University of Thessaloniki, Thessaloniki 541.24, Greece
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Academic Editors: Michel Feidt, Daniel Tondeur, Jean-Noël Jaubert and Romain Privat
Entropy 2016, 18(3), 94;
Received: 28 November 2015 / Revised: 24 January 2016 / Accepted: 3 March 2016 / Published: 12 March 2016
(This article belongs to the Special Issue Selected Papers from 13th Joint European Thermodynamics Conference)
In this article, we review a series of recent theoretical results regarding a conventional approach to the dark energy (DE) concept. This approach is distinguished among others for its simplicity and its physical relevance. By compromising General Relativity (GR) and Thermodynamics at cosmological scale, we end up with a model without DE. Instead, the Universe we are proposing is filled with a perfect fluid of self-interacting dark matter (DM), the volume elements of which perform hydrodynamic flows. To the best of our knowledge, it is the first time in a cosmological framework that the energy of the cosmic fluid internal motions is also taken into account as a source of the universal gravitational field. As we demonstrate, this form of energy may compensate for the DE needed to compromise spatial flatness, while, depending on the particular type of thermodynamic processes occurring in the interior of the DM fluid (isothermal or polytropic), the Universe depicts itself as either decelerating or accelerating (respectively). In both cases, there is no disagreement between observations and the theoretical prediction of the distant supernovae (SNe) Type Ia distribution. In fact, the cosmological model with matter content in the form of a thermodynamically-involved DM fluid not only interprets the observational data associated with the recent history of Universe expansion, but also confronts successfully with every major cosmological issue (such as the age and the coincidence problems). In this way, depending on the type of thermodynamic processes in it, such a model may serve either for a conventional DE cosmology or for a viable alternative one. View Full-Text
Keywords: dark matter; dark energy; accelerating Universe; isothermal processes; polytropic; dark matter; dark energy; accelerating Universe; isothermal processes; polytropic;
PACS: 95.35.+d; 95.36.+x; 98.80.Es; 98.80.-k Show Figures

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Kleidis, K.; Spyrou, N.K. Dark Energy: The Shadowy Reflection of Dark Matter? Entropy 2016, 18, 94.

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