Comment on "An axially symmetric spacetime with causality violation [Phys. Scr. 96 (07), 075208 (2021)], arXiv:2004.13769[gr-qc]"

TL;DR

This paper critiques a recent publication claiming a new axially symmetric spacetime with causality violation, arguing it is a duplicate of an earlier work and thus not novel.

Contribution

It clarifies that the recent work is a duplicate of a previously published paper, emphasizing the importance of originality in scientific research.

Findings

The recent paper is a duplicate of an earlier publication.

The spacetime described has a type III metric with specific properties.

The work involves a pure radial matter-energy field with a negative cosmological constant.

Abstract

Recently, an axially symmetric spacetime with causality violation is appeared in Ref. [1]. There, author presented a type III metric with vanishing expansion, shear and twist. The matter-energy represents a pure radial field with a negative cosmological constant. The spacetime is asymptotically anti-de Sitter space in the radial direction. Actually, this work with different for the metric was already published in Ref. [4]. Therefore, the current paper Ref. [1] is a duplicate one of the previous work.