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Automodel solutions for superdiffusive transport by Levy walks

机译:由征收步行的超级优质运输机构的汽车解决方案

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The method of approximate automodel solution for the Green's function of time-dependent superdiffusive (nonlocal) transport equations (Kukushkin A B and Sdvizhenskii P A 2016 J. Phys. A: Math. Theor. 49 255002) is extended to the case of a finite velocity of carriers. This corresponds to an extension from Levy flight based transport to transport of a type which belongs to the class of 'Levy walks + rests', to allow for retardation effects in Levy flights. This problem covers the cases of transport by resonant photons in astrophysical gases and plasmas, heat transport by electromagnetic waves in plasmas, migration of predators, and other applications. We treat a model case of 1D transport on a uniform background with a simple power-law step-length probability distribution function (PDF). A solution for the arbitrary superdiffusive PDF is suggested, and verification of the solution for a particular power-law PDF, which corresponds, e.g., to Lorentzian wings of atomic spectral line shapes for the emission of photons, is carried out using the computation of the exact solution.
机译:近似自动读取时间依赖于依赖于依赖的超级优质(非本体)传输方程式函数的方法(Kukushkin Ab和Sdvizhenskii Pa 2016 J. phys。答:数学。49 255002)延伸到有限速度的情况载体。这对应于征收飞行运输到运输属于“征收步行+休息”类的传输的延伸,以允许征收航班中的延迟效应。该问题涵盖了天体物理气体和等离子体中的共振光子的运输案例,通过等离子体中的电磁波,捕食者迁移和其他应用的热传输。我们对统一背景上的1D运输模型案例,具有简单的电力法步长概率分布函数(PDF)。提出了一种用于任意优质化的PDF的解决方案,并验证了特定的电力 - 法PDF的解决方案,其对应于用于发射光子的原子谱线形状的Lorentzian翅膀,使用该计算精确的解决方案。

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