The kinetic gas universe

Understand

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.