Details
| Original language | English |
|---|---|
| Article number | 809 |
| Journal | European Physical Journal C |
| Volume | 80 |
| Issue number | 9 |
| Publication status | Published - 2 Sept 2020 |
| Externally published | Yes |
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.
ASJC Scopus subject areas
- Engineering(all)
- Engineering (miscellaneous)
- Physics and Astronomy(all)
- Physics and Astronomy (miscellaneous)
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In: European Physical Journal C, Vol. 80, No. 9, 809, 02.09.2020.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - The kinetic gas universe
AU - Hohmann, Manuel
AU - Pfeifer, Christian
AU - Voicu, Nicoleta
N1 - Funding information: C.P. and M.H. were supported by the Estonian Ministry for Education and Science through the Personal Research Funding Grants PSG489 (C.P.) and PRG356 (M.H.), as well as the European Regional Development Fund through the Center of Excellence TK133 “The Dark Side of the Universe”. The authors would like to acknowledge networking support by the COST Actions CANTATA (CA15117) and QGMM (CA18108), supported by COST (European Cooperation in Science and Technology). C.P. and M.H. were supported by the Estonian Ministry for Education and Science through the Personal Research Funding Grants PSG489 (C.P.) and PRG356 (M.H.), as well as the European Regional Development Fund through the Center of Excellence TK133 ?The Dark Side of the Universe?. The authors would like to acknowledge networking support by the COST Actions CANTATA (CA15117) and QGMM (CA18108), supported by COST (European Cooperation in Science and Technology).
PY - 2020/9/2
Y1 - 2020/9/2
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85090082704&partnerID=8YFLogxK
U2 - 10.1140/epjc/s10052-020-8391-y
DO - 10.1140/epjc/s10052-020-8391-y
M3 - Article
VL - 80
JO - European Physical Journal C
JF - European Physical Journal C
SN - 1434-6044
IS - 9
M1 - 809
ER -