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Linear growth of structure in the symmetron model

Brax, P.; van de Bruck, C.; Davis, A.-C.; Li, B.; Schmauch, B.; Shaw, D.J.

Authors

P. Brax

C. van de Bruck

A.-C. Davis

B. Schmauch

D.J. Shaw



Abstract

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.

Journal Article Type Article
Publication Date Dec 29, 2011
Deposit Date Jan 20, 2012
Publicly Available Date Jul 16, 2014
Journal Physical Review D
Print ISSN 1550-7998
Electronic ISSN 1550-2368
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 84
Article Number 123524
DOI https://doi.org/10.1103/physrevd.84.123524
Public URL https://durham-repository.worktribe.com/output/1530736

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