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Comment on "Dark Energy from Time Crystals"

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arxiv 2502.19448 v2 pith:74237WOH submitted 2025-02-25 hep-ph gr-qchep-th

James M. Cline This is my paper · ORCID
classification hep-phgr-qchep-th
keywords energydarkmodeltimearxivcommentcrystalcrystals
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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.

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  1. A Note on the Stability of the Dark Energy Model from Time Crystals

    gr-qc 2025-04 reject novelty 4.0 of 10

    The author claims that Hubble drag from the expanding FRW background drives perturbations in a time-crystal phantom dark energy model to decay, but the analysis drops metric perturbations and contains a sign error in ...

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