Journal
PHYSICAL REVIEW D
Volume 84, Issue 12, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.84.123524
Keywords
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Funding
- STFC
- Queens' College and Department of Applied Mathematics and Theoretical Physics at the University of Cambridge
- STFC [ST/J000434/1, ST/G000581/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/G000581/1, ST/J000434/1] Funding Source: researchfish
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In the symmetron mechanism, the fifth force mediated by a coupled scalar field (the symmetron) is suppressed in high-density regions due to the restoration of symmetry in the symmetron potential. In this paper we study the background cosmology and large-scale structure formation in the linear perturbation regime of the symmetron model. Analytic solutions to the symmetron in the cosmological background are found, which agree well with numerical results. We discuss the effect of the symmetron perturbation on the growth of matter perturbation, in particular, the implications of the brief period of tachyonic instability caused by the negative mass-squared of the symmetron during symmetry breaking. Our analysis and numerical results show that this instability has only very small effects on the growth of structures on subhorizon scales, and even at horizon scales its influence is not as drastic as naively expected. The symmetron fifth force in the nontachyonic regime does affect the formation of structure in a nontrivial way which could be cosmologically observable.
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