Comment on "Spherically symmetric perfect fluid in area-radial coordinates" by Iguchi et al

TL;DR

This paper defends previous work on gravitational collapse of perfect fluids against recent criticisms, clarifying misunderstandings and reaffirming the validity of earlier findings.

Contribution

It provides a rebuttal to critiques of prior research, reaffirming the correctness of earlier results on perfect fluid collapse.

Findings

Criticisms are incorrect and unfounded.

Previous results on gravitational collapse remain valid.

Clarification of misunderstandings in recent critique.

Abstract

In this short note we comment about some criticisms - appeared in a recent paper by Iguchi et al - to our previous works on gravitational collapse of perfect fluids. We show that those criticisms are incorrect on their own.