Comment on "Dynamic Opinion Model and Invasion Percolation"

TL;DR

This paper challenges a previous claim by providing high-statistics simulations that show the model in question belongs to the ordinary percolation universality class, not invasion percolation with trapping.

Contribution

It offers a detailed critique and new simulation evidence demonstrating the model's universality class, correcting prior misconceptions.

Findings

Model belongs to the ordinary percolation universality class

High-statistics simulations on larger lattices support the conclusion

Previous claims of invasion percolation universality are refuted

Abstract

In J. Shao et al., PRL 103, 108701 (2009) the authors claim that a model with majority rule coarsening exhibits in d=2 a percolation transition in the universality class of invasion percolation with trapping. In the present comment we give compelling evidence, including high statistics simulations on much larger lattices, that this is not correct. and that the model is trivially in the ordinary percolation universality class.