Comment on "Dark Energy from Time Crystals"
High Energy Physics - Phenomenology
2025-03-10 v2 General Relativity and Quantum Cosmology
High Energy Physics - Theory
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.
Cite
@article{arxiv.2502.19448,
title = {Comment on "Dark Energy from Time Crystals"},
author = {James M. Cline},
journal= {arXiv preprint arXiv:2502.19448},
year = {2025}
}
Comments
2 pages, 1 figure; comment on arxiv:2502.08887. v2: added reference to stability criteria