# American Institute of Mathematical Sciences

October  2019, 12(5): 1185-1196. doi: 10.3934/krm.2019045

## Diffusion limit for a kinetic equation with a thermostatted interface

 1 Dipartimento di Matematica, Università di Roma La Sapienza, Roma, Italy 2 IMPAN, Polish Academy of Sciences, Warsaw, Poland 3 CEREMADE, UMR CNRS, Université Paris-Dauphine, PSL Research University, 75016 Paris, France

* Corresponding author: Stefano Olla

Received  March 2019 Published  July 2019

Fund Project: T.K. acknowledges the support of the National Science Centre: NCN grant 2016/23/B/ST1/00492. SO's research is supported by ANR-15-CE40-0020-01 grant LSD. Both T.K. and S.O. were partially supported by the grant 346300 for IMPAN from the Simons Foundation and the matching 2015-2019 Polish MNiSW fund

We consider a linear phonon Boltzmann equation with a reflecting/transmitting/absorbing interface. This equation appears as the Boltzmann-Grad limit for the energy density function of a harmonic chain of oscillators with inter-particle stochastic scattering in the presence of a heat bath at temperature $T$ in contact with one oscillator at the origin. We prove that under the diffusive scaling the solutions of the phonon equation tend to the solution $\rho(t, y)$ of a heat equation with the boundary condition $\rho(t, 0)\equiv T$.

Citation: Giada Basile, Tomasz Komorowski, Stefano Olla. Diffusion limit for a kinetic equation with a thermostatted interface. Kinetic & Related Models, 2019, 12 (5) : 1185-1196. doi: 10.3934/krm.2019045
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