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, 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.
Cite
@article{arxiv.2005.13561,
title = {The kinetic gas universe},
author = {Manuel Hohmann and Christian Pfeifer and Nicoleta Voicu},
journal= {arXiv preprint arXiv:2005.13561},
year = {2020}
}
Comments
4 pages, Essay written for the Gravity Research Foundation competition 2020, Journal references updated