Comment on "Dark Energy from Time Crystals"

Abstract

It was recently proposed (arxiv:2502.08887) that the time crystal Lagrangian introduced by Shapere and Wilczek in 2012 could be a model of dark energy. I point out that the model has an instability that drives its energy density to negative values, which may render it unsuitable as a model of dark energy.

Comments: 2 pages, 1 figure; comment on arxiv:2502.08887. v2: added reference to stability criteria