Abstract
The present contribution investigates the dynamics generated by the two-dimensional Vlasov-Poisson-Fokker-Planck equation for charged particles in a steady inhomogeneous background of opposite charges. We provide global in time estimates that are uniform with respect to initial data taken in a bounded set of a weighted \(L^2\) space, and where dependencies on the mean-free path \(\tau \) and the Debye length \(\delta \) are made explicit. In our analysis the mean free path covers the full range of possible values: from the regime of evanescent collisions \(\tau \rightarrow \infty \) to the strongly collisional regime \(\tau \rightarrow 0\). As a counterpart, the largeness of the Debye length, that enforces a weakly nonlinear regime, is used to close our nonlinear estimates. Accordingly we pay a special attention to relax as much as possible the \(\tau \)-dependent constraint on \(\delta \) ensuring exponential decay with explicit \(\tau \)-dependent rates towards the stationary solution. In the strongly collisional limit \(\tau \rightarrow 0\), we also examine all possible asymptotic regimes selected by a choice of observation time scale. Here also, our emphasis is on strong convergence, uniformity with respect to time and to initial data in bounded sets of a \(L^2\) space. Our proofs rely on a detailed study of the nonlinear elliptic equation defining stationary solutions and a careful tracking and optimization of parameter dependencies of hypocoercive/hypoelliptic estimates.
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Notes
In contrast we use the term for any limit corresponding to sending the diffusive parameter to infinity.
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Acknowledgements
Research of L. Miguel Rodrigues was partially supported by the ANR Project BoND ANR-13-BS01-0009-01.
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Herda, M., Rodrigues, L.M. Large-Time Behavior of Solutions to Vlasov-Poisson-Fokker-Planck Equations: From Evanescent Collisions to Diffusive Limit. J Stat Phys 170, 895–931 (2018). https://doi.org/10.1007/s10955-018-1963-7
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DOI: https://doi.org/10.1007/s10955-018-1963-7