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Stable Cosmic Time Crystals

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arxiv 1802.03693 v2 pith:6K727MUD submitted 2018-02-11 hep-th gr-qc

Damien A. Easson , Tucker Manton This is my paper · ORCID
classification hep-thgr-qc
keywords cosmologicaltimecrystalsscalarstableanalysisbecomescondition
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Cosmological time crystals are created when a scalar field moves periodically through phase space in a spatially flat Friedmann-Robertson-Walker spacetime due to the presence of a limit cycle. All such cosmological time crystals in the literature suffer from gradient instabilities occurring at Null Energy Condition violating phases where the square sound speed for cosmological perturbations becomes negative. Here we present stable cosmological time crystals. Our analysis suggests this new form of scalar matter--cosmic time crystals--may be considered as a physically viable cosmological matter source.

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Cited by 1 Pith paper

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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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