Simulating the quartic Galileon gravity model on adaptively refined meshes

	Simulating the quartic Galileon gravity model on adaptively refined meshes
	Li, Baojiu 1; Barreira, Alexandre 1,2; Baugh, Carlton M.1; Hellwing, Wojciech A.1,3; Koyama, Kazuya 4; Pascoli, Silvia 2; Zhao, Gong-Bo4,5
刊名	JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
	2013-11-01
期号	11
关键词	modified gravity power spectrum cosmological simulations dark energy theory
英文摘要	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 con figurations 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.
收录类别	SCI
语种	英语
WOS记录号	WOS:000327843900013
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/6008]
专题	国家天文台_星系宇宙学研究部
作者单位	1.Univ Durham, Dept Phys, Inst Computat Cosmol, Durham DH1 3LE, England 2.Univ Durham, Dept Phys, Inst Particle Phys Phenomenol, Durham DH1 3LE, England 3.Univ Warsaw, Interdisciplinary Ctr Math & Computat Modelling, Warsaw, Poland 4.Univ Portsmouth, Inst Cosmol & Gravitat, Portsmouth PO1 3FX, Hants, England 5.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
推荐引用方式 GB/T 7714	Li, Baojiu,Barreira, Alexandre,Baugh, Carlton M.,et al. Simulating the quartic Galileon gravity model on adaptively refined meshes[J]. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS,2013(11).
APA	Li, Baojiu.,Barreira, Alexandre.,Baugh, Carlton M..,Hellwing, Wojciech A..,Koyama, Kazuya.,...&Zhao, Gong-Bo.(2013).Simulating the quartic Galileon gravity model on adaptively refined meshes.JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS(11).
MLA	Li, Baojiu,et al."Simulating the quartic Galileon gravity model on adaptively refined meshes".JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS .11(2013).