A comment on "Importance of resolving the spectral support of beam-plasma instabilities in simulations" by M. Shalaby et al

TL;DR

This paper defends the validity of specific particle-in-cell simulations of beam-plasma systems against recent criticisms, confirming they meet the new spectral support criteria essential for accurate astrophysical modeling.

Contribution

It provides a detailed analysis showing that the criticized simulations satisfy the updated validity criteria for beam-plasma instability modeling.

Findings

Simulations fulfill the new spectral support validity criteria

Criticism of the simulations is addressed and refuted

Supports the reliability of particle-in-cell methods in astrophysics

Abstract

Understanding the physics of beam-plasma systems is of great importance for a large number of astrophysical systems. Recently the validity of particle-in-cell simulations of these systems has been questioned by Shalaby et al. (2017) We analyse one specific beam-plasma and its numerical simulations Kempf et al. (2016) that has been critized and prove that in fact the simulations performed fulfill the new validity criteria introduced by Shalaby et al. (2016).