Comment on "Deformed Fokker-Planck equation: Inhomogeneous medium with a position-dependent mass"

In a recent paper by B. G. da Costa et al. [Phys. Rev. E 102, 062105 (2020)2470-004510.1103/PhysRevE.102.062105], the phenomenological Langevin equation and the corresponding Fokker-Planck equation for an inhomogeneous medium with a position-dependent particle mass and position-dependent damping coe...

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Bibliographic Details
Published in:Physical review. E 2021-03, Vol.103 (3-2), p.036101-036101, Article 036101
Main Author: Łuczka, J
Format: Article
Language:English
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Summary:In a recent paper by B. G. da Costa et al. [Phys. Rev. E 102, 062105 (2020)2470-004510.1103/PhysRevE.102.062105], the phenomenological Langevin equation and the corresponding Fokker-Planck equation for an inhomogeneous medium with a position-dependent particle mass and position-dependent damping coefficient have been studied. The aim of this comment is to present a microscopic derivation of the Langevin equation for such a system. It is not equivalent to that in the commented paper.
ISSN:2470-0045
2470-0053
DOI:10.1103/PhysRevE.103.036101