Kinetic theory describes a dilute monatomic gas using a distribution function $f(q,p,t)$, the expected phase-space density of particles. The distribution function evolves according to the collisionless Boltzmann equation in the high Knudsen number limit. Fluid dynamics is an alternative description of the gas using hydrodynamic variables that are functions of position and time only. These hydrodynamic variables evolve according to the compressible Euler equations in the inviscid limit. Both systems are noncanonical Hamiltonian systems. Each configuration space is an infinite-dimensional Poisson manifold, and the dynamics is the flow generated by a Hamiltonian functional via a Poisson bracket. We construct a map $\mathcal{J}_1$ from the space of distribution functions to the space of hydrodynamic variables that respects the Poisson brackets on the two spaces i.e. a Poisson map. It maps the $p$-integral of the Boltzmann entropy $f\log f$ to the hydrodynamic entropy density. This map belongs to a family of Poisson maps to spaces that include generalised entropy densities as additional hydrodynamic variables. The whole family can be generated from the Taylor expansion of a further Poisson map that depends on a formal parameter. If the kinetic-theory Hamiltonian factors through the Poisson map $\mathcal{J}_1$, an exact reduction of kinetic theory to fluid dynamics is possible. This is not the case, but by ignoring the relative entropy of $f$ to its local Maxwellian, we can construct an approximate Hamiltonian that factors through the map. The resulting reduced Hamiltonian generates the compressible Euler equations. We can thus derive the compressible Euler equations as a Hamiltonian approximation to kinetic theory. We also give an analogous Hamiltonian derivation of the compressible Euler--Poisson equations with non-constant entropy, starting from the Vlasov--Poisson equation.
Time-dependent rescalings and Lyapunov functionals for the Vlasov-Poisson and Euler-Poisson systems, and for related models of kinetic equations, fluid dynamics and quantum physics
Kinetic Theory and the Mechanics of Isothermal Gas Spheres: Derivation of the Classical Emden--Chandrasekhar Equation via the Vlasov--Poisson Formalism
Spherically symmetric equilibria for self-gravitating kinetic or fluid models in the non-relativistic and relativistic case - A simple proof for finite extension
Structure preservation using discrete gradients in the Vlasov-Poisson-Landau system
National Research Council, Naval Research Laboratory（国家研究委员会，海军研究实验室）；University at Buffalo, The State University of New York（纽约州立大学布法罗分校）；Lawrence Berkeley National Laboratory（劳伦斯伯克利国家实验室）
Homogeneous potentials, Lagrange's identity and Poisson geometry
International Laboratory for Mirror Symmetry（国际镜像对称实验室）；National Research University Higher School of Economics, Moscow, Russia（国立高等经济大学）；Beijing Institute of Mathematical Sciences and Applications, Beijing, China（北京数学与应用科学研究所）
