Comment on 'Another form of the Klein-Gordon equation'
A. Aste (U. of Basel)

TL;DR
This paper critically evaluates an alternative Klein-Gordon equation proposed by Kostin, demonstrating that it fails to meet relativistic quantum field theory requirements and lacks a meaningful physical interpretation.
Contribution
It provides a critical analysis showing that Kostin's alternative Klein-Gordon equation is incompatible with fundamental relativistic quantum principles.
Findings
Kostin's equation does not satisfy relativistic field theory requirements
The proposed probability density is not physically meaningful
The equation cannot be used for consistent physical interpretation
Abstract
It is shown that the alternative Klein-Gordon equation with positive definite probability density proposed in a letter by M.D. Kostin does not meet the requirements of relativistic (quantum) field theory and therefore does not allow for a meaningful physical interpretation.
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