In this note, we investigate the stability of the dark energy model from time
crystals proposed in [1]. We emphasize two ingredients, the coupling of the
scalar field to gravity, and the fact that these time crystals are on an
expanding FRW background, which play a crucial role in the field’s dynamics.
The Hubble parameter, which contributes a drag term to the equations of motion,
grows with time until the scale factor diverges. When taken into account, these
factors also alleviate the stability concern of [2].

Dieser Artikel untersucht Zeitreisen und deren Auswirkungen.

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