The kinetic gas universe
Abstract A description of many-particle systems, which is more fundamental than the fluid approach, is to consider them as a kinetic gas. In this approach the dynamical variable in which the properties of the system are encoded, is the distribution of the gas particles in position and velocity space...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
SpringerOpen
2020-09-01
|
| Series: | European Physical Journal C: Particles and Fields |
| Online Access: | http://link.springer.com/article/10.1140/epjc/s10052-020-8391-y |
| _version_ | 1818289862366724096 |
|---|---|
| author | Manuel Hohmann Christian Pfeifer Nicoleta Voicu |
| author_facet | Manuel Hohmann Christian Pfeifer Nicoleta Voicu |
| author_sort | Manuel Hohmann |
| collection | DOAJ |
| description | Abstract A description of many-particle systems, which is more fundamental than the fluid approach, is to consider them as a kinetic gas. In this approach the dynamical variable in which the properties of the system are encoded, is the distribution of the gas particles in position and velocity space, called 1-particle distribution function (1PDF). However, when the gravitational field of a kinetic gas is derived via the Einstein-Vlasov equations, the information about the velocity distribution of the gas particles is averaged out and therefore lost. We propose to derive the gravitational field of a kinetic gas directly from its 1PDF, taking the velocity distribution fully into account. We conjecture that this refined approach could possibly account for the observed dark energy phenomenology. |
| first_indexed | 2024-12-13T02:19:01Z |
| format | Article |
| id | doaj.art-1e2bb9d6aee44d76b51bac6918c7599a |
| institution | Directory Open Access Journal |
| issn | 1434-6044 1434-6052 |
| language | English |
| last_indexed | 2024-12-13T02:19:01Z |
| publishDate | 2020-09-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | European Physical Journal C: Particles and Fields |
| spelling | doaj.art-1e2bb9d6aee44d76b51bac6918c7599a2022-12-22T00:02:49ZengSpringerOpenEuropean Physical Journal C: Particles and Fields1434-60441434-60522020-09-018091410.1140/epjc/s10052-020-8391-yThe kinetic gas universeManuel Hohmann0Christian Pfeifer1Nicoleta Voicu2Laboratory of Theoretical Physics, Institute of Physics, University of TartuLaboratory of Theoretical Physics, Institute of Physics, University of TartuFaculty of Mathematics and Computer Science, Transilvania UniversityAbstract A description of many-particle systems, which is more fundamental than the fluid approach, is to consider them as a kinetic gas. In this approach the dynamical variable in which the properties of the system are encoded, is the distribution of the gas particles in position and velocity space, called 1-particle distribution function (1PDF). However, when the gravitational field of a kinetic gas is derived via the Einstein-Vlasov equations, the information about the velocity distribution of the gas particles is averaged out and therefore lost. We propose to derive the gravitational field of a kinetic gas directly from its 1PDF, taking the velocity distribution fully into account. We conjecture that this refined approach could possibly account for the observed dark energy phenomenology.http://link.springer.com/article/10.1140/epjc/s10052-020-8391-y |
| spellingShingle | Manuel Hohmann Christian Pfeifer Nicoleta Voicu The kinetic gas universe European Physical Journal C: Particles and Fields |
| title | The kinetic gas universe |
| title_full | The kinetic gas universe |
| title_fullStr | The kinetic gas universe |
| title_full_unstemmed | The kinetic gas universe |
| title_short | The kinetic gas universe |
| title_sort | kinetic gas universe |
| url | http://link.springer.com/article/10.1140/epjc/s10052-020-8391-y |
| work_keys_str_mv | AT manuelhohmann thekineticgasuniverse AT christianpfeifer thekineticgasuniverse AT nicoletavoicu thekineticgasuniverse AT manuelhohmann kineticgasuniverse AT christianpfeifer kineticgasuniverse AT nicoletavoicu kineticgasuniverse |