Comment on "Fully covariant radiation force on a polarizable particle"
A.I.Volokitin, B.N.J.Persson

TL;DR
This paper compares a recent covariant theory of Casimir friction on a particle with a relativistic plate-plate theory, demonstrating their agreement in the dilute limit, thus validating the new approach.
Contribution
It provides a comparison and validation of a new covariant theory of Casimir friction against established relativistic plate-plate models in the dilute limit.
Findings
The covariant theory agrees with the relativistic plate-plate theory in the dilute limit.
The comparison confirms the validity of the new covariant approach.
The results support the consistency of different theoretical frameworks for Casimir friction.
Abstract
Recently Pieplow and Henkel (PH) (NJP \textbf{15} (2013) 023027) presented a new fully covariant theory of the Casimir friction force acting on small neutral particle moving parallel to flat surface. We compare results of this theory with results which follow from a fully relativistic theory of friction in plate-plate configurations in the limit when one plate is considered as sufficiently rarefied. We show that there is the agreement between these theories.
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