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Simulating the quartic Galileon gravity model on adaptively refined meshes

Li, B.; Barreira, A.; Baugh, C.M.; Hellwing, W.A.; Koyama, K.; Pascoli, S.; Zhao, G.

Authors

A. Barreira

W.A. Hellwing

K. Koyama

S. Pascoli

G. Zhao



Abstract

We develop a numerical algorithm to solve the high-order nonlinear derivative-coupling equation associated with the quartic Galileon model, and implement it in a modified version of the ramses N-body code to study the effect of the Galileon field on the large-scale matter clustering. The algorithm is tested for several matter field configurations with different symmetries, and works very well. This enables us to perform the first simulations for a quartic Galileon model which provides a good fit to the cosmic microwave background (CMB) anisotropy, supernovae and baryonic acoustic oscillations (BAO) data. Our result shows that the Vainshtein mechanism in this model is very efficient in suppressing the spatial variations of the scalar field. However, the time variation of the effective Newtonian constant caused by the curvature coupling of the Galileon field cannot be suppressed by the Vainshtein mechanism. This leads to a significant weakening of the strength of gravity in high-density regions at late times, and therefore a weaker matter clustering on small scales. We also find that without the Vainshtein mechanism the model would have behaved in a completely different way, which shows the crucial role played by nonlinearities in modified gravity theories and the importance of performing self-consistent N-body simulations for these theories.

Citation

Li, B., Barreira, A., Baugh, C., Hellwing, W., Koyama, K., Pascoli, S., & Zhao, G. (2013). Simulating the quartic Galileon gravity model on adaptively refined meshes. Journal of Cosmology and Astroparticle Physics, 2013(11), Article 12. https://doi.org/10.1088/1475-7516/2013/11/012

Journal Article Type Article
Publication Date Nov 7, 2013
Deposit Date Nov 7, 2013
Publicly Available Date May 8, 2014
Journal Journal of Cosmology and Astroparticle Physics
Publisher IOP Publishing
Peer Reviewed Peer Reviewed
Volume 2013
Issue 11
Article Number 12
DOI https://doi.org/10.1088/1475-7516/2013/11/012
Keywords Modified gravity, Power spectrum, Cosmological simulations, Dark energy theory.
Public URL https://durham-repository.worktribe.com/output/1447481
Publisher URL http://iopscience.iop.org/1475-7516/2013/11/012/

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