Dark Energy as a Natural Property of Cosmic Polytropes—A Tutorial
A conventional approach to the dark energy (DE) concept is reviewed and discussed. According to it, there is absolutely no need for a novel DE component in the universe, provided that its matter–energy content is represented by a perfect fluid whose volume elements perform polytropic flows. When the...
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2023-02-01
|
| Series: | Dynamics |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2673-8716/3/1/6 |
| _version_ | 1797612316181659648 |
|---|---|
| author | Kostas Kleidis Nikolaos K. Spyrou |
| author_facet | Kostas Kleidis Nikolaos K. Spyrou |
| author_sort | Kostas Kleidis |
| collection | DOAJ |
| description | A conventional approach to the dark energy (DE) concept is reviewed and discussed. According to it, there is absolutely no need for a novel DE component in the universe, provided that its matter–energy content is represented by a perfect fluid whose volume elements perform polytropic flows. When the (thermodynamic) energy of the associated internal motions is taken into account as an additional source of the universal gravitational field, it compensates the DE needed to compromise spatial flatness in an accelerating universe. The unified model which is driven by a polytropic fluid not only interprets the observations associated with universe expansion but successfully confronts all the current issues of cosmological significance, thus arising as a viable alternative to the <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mo>Λ</mo></semantics></math></inline-formula>CDM model. |
| first_indexed | 2024-03-11T06:39:33Z |
| format | Article |
| id | doaj.art-1c4f3adfedc142a89a13fc46ca370ca5 |
| institution | Directory Open Access Journal |
| issn | 2673-8716 |
| language | English |
| last_indexed | 2024-03-11T06:39:33Z |
| publishDate | 2023-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Dynamics |
| spelling | doaj.art-1c4f3adfedc142a89a13fc46ca370ca52023-11-17T10:40:10ZengMDPI AGDynamics2673-87162023-02-0131719510.3390/dynamics3010006Dark Energy as a Natural Property of Cosmic Polytropes—A TutorialKostas Kleidis0Nikolaos K. Spyrou1Department of Mechanical Engineering, International Hellenic University, Serres Campus, 621 24 Serres, GreeceDepartment of Astronomy, Aristotle University of Thessaloniki, 541 24 Thessaloniki, GreeceA conventional approach to the dark energy (DE) concept is reviewed and discussed. According to it, there is absolutely no need for a novel DE component in the universe, provided that its matter–energy content is represented by a perfect fluid whose volume elements perform polytropic flows. When the (thermodynamic) energy of the associated internal motions is taken into account as an additional source of the universal gravitational field, it compensates the DE needed to compromise spatial flatness in an accelerating universe. The unified model which is driven by a polytropic fluid not only interprets the observations associated with universe expansion but successfully confronts all the current issues of cosmological significance, thus arising as a viable alternative to the <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mo>Λ</mo></semantics></math></inline-formula>CDM model.https://www.mdpi.com/2673-8716/3/1/6dark matterdark energyaccelerating universepolytropic flows |
| spellingShingle | Kostas Kleidis Nikolaos K. Spyrou Dark Energy as a Natural Property of Cosmic Polytropes—A Tutorial Dynamics dark matter dark energy accelerating universe polytropic flows |
| title | Dark Energy as a Natural Property of Cosmic Polytropes—A Tutorial |
| title_full | Dark Energy as a Natural Property of Cosmic Polytropes—A Tutorial |
| title_fullStr | Dark Energy as a Natural Property of Cosmic Polytropes—A Tutorial |
| title_full_unstemmed | Dark Energy as a Natural Property of Cosmic Polytropes—A Tutorial |
| title_short | Dark Energy as a Natural Property of Cosmic Polytropes—A Tutorial |
| title_sort | dark energy as a natural property of cosmic polytropes a tutorial |
| topic | dark matter dark energy accelerating universe polytropic flows |
| url | https://www.mdpi.com/2673-8716/3/1/6 |
| work_keys_str_mv | AT kostaskleidis darkenergyasanaturalpropertyofcosmicpolytropesatutorial AT nikolaoskspyrou darkenergyasanaturalpropertyofcosmicpolytropesatutorial |