Anomalous Diffusion Limit of Kinetic Equations in Spatially Bounded Domains

Anomalous Diffusion Limit of Kinetic Equations in Spatially Bounded Domains
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空间有界域中动力学方程的反常扩散极限

DOI:
10.1007/s00220-018-3158-0
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发表时间:
2016
影响因子:
2.4
通讯作者:
L. Cesbron
L. Cesbron
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
L. Cesbron

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研究了具有分数阶Fokker-Planck碰撞算子的动力学方程在空间有界域上的反常扩散极限。我们在动力学尺度上考虑两种边界条件:吸收和镜面反射。在吸收情况下,我们证明了长时间/小平均自由程渐近动力学是由分数阶扩散方程描述的,该方程具有齐次dirichlet型边界条件,设置在空间域的整个补上。另一方面,镜面反射会产生一个新的算子,我们称之为镜面扩散算子,写为$${(-\Delta)_{{\rm SR}}^{s}}$$ (-Δ) sr。这种非局部扩散算子强烈依赖于区域的几何形状,并在其定义中包含了扩散与边界之间的相互作用。我们考虑了$${\mathbb{R}^d}$$ Rd中的半空间和球两种类型的区域。在这些区域中,我们证明了镜面扩散算子的性质,并建立了相关热型方程弱解的存在唯一性。
This paper is devoted to the anomalous diffusion limit of kinetic equations with a fractional Fokker–Planck collision operator in a spatially bounded domain. We consider two boundary conditions at the kinetic scale: absorption and specular reflection. In the absorption case, we show that the long time/small mean free path asymptotic dynamics are described by a fractional diffusion equation with homogeneous Dirichlet-type boundary conditions set on the whole complement of the spatial domain. On the other hand, specular reflections will give rise to a new operator which we call specular diffusion operator and write $${(-\Delta)_{{\rm SR}}^{s}}$$(-Δ)SRs. This non-local diffusion operator strongly depends on the geometry of the domain and includes in its definition the interaction between the diffusion and the boundary. We consider two types of domains: half-spaces and balls in $${\mathbb{R}^d}$$Rd. In these domains, we prove properties of the specular diffusion operator and establish existence and uniqueness of weak solutions to the associated heat-type equation.
DOI: 10.1007/s00222-016-0670-8
发表时间: 2012-12
影响因子: 3.1
作者:
Yan Guo;Chanwoo Kim;D. Tonon;A. Trescases
通讯作者: Yan Guo;Chanwoo Kim;D. Tonon;A. Trescases
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发表时间: 2014-07
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影响因子: --
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