Stable cosmic time crystals

Damien A. Easson; Tucker Manton

doi:10.1103/PhysRevD.99.043507

Stable cosmic time crystals

Damien A. Easson, Tucker Manton

Physics

Research output: Contribution to journal › Article › peer-review

9 Scopus citations

Abstract

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.

Original language	English (US)
Article number	043507
Journal	Physical Review D
Volume	99
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevD.99.043507
State	Published - Feb 15 2019

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1103/PhysRevD.99.043507

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Stable cosmic time crystals

Abstract

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