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Exploring Vainshtein mechanism on adaptively refined meshes.

Li, B. and Zhao, G. and Koyama, K. (2013) 'Exploring Vainshtein mechanism on adaptively refined meshes.', Journal of cosmology and astroparticle physics., 2013 (05). 023.

Abstract

There has been a lot of research interest in modified gravity theories which utilise the Vainshtein mechanism to recover standard general relativity in regions with high matter density, such as the Dvali-Gabadadze-Porrati and Galileon models. The strong nonlinearity in the field equations of these theories implies that accurate theoretical predictions could only be made using high-resolution cosmological simulations. Previously, such simulations were usually done on regular meshes, which limits both their performance and the accuracy. In this paper, we report the development of a new algorithm and code, based on ECOSMOG, that uses adaptive mesh refinements to improve the efficiency and precision in simulating the models with Vainshtein mechanism. We have made various code tests against the numerical reliability, and found consistency with previous simulations. We also studied the velocity field in the self-accelerating branch of the DGP model. The code, parallelised using MPI, is suitable for large cosmological simulations of Galileon-type modified gravity theories.

Item Type:Article
Additional Information:E-print Number: 1303.0008
Keywords:Modified gravity, Power spectrum, Cosmological simulations, Particle physics - cosmology connection.
Full text:(NA) Not Applicable
Download PDF (arXiv version)
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Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1088/1475-7516/2013/05/023
Publisher statement:This is an author-created, un-copyedited version of an article accepted for publication in Journal of Cosmology and Astroparticle Physics. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at http://dx.doi.org/10.1088/1475-7516/2013/05/023.
Date accepted:No date available
Date deposited:No date available
Date of first online publication:May 2013
Date first made open access:No date available

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