Speeding up N-body simulations of modified gravity: chameleon screening models
文献类型：期刊论文
| 作者 | Bose, Sownak1; Li, Baojiu1; Barreira, Alexandre2; He, Jian-hua1; Hellwing, Wojciech A.3,4; Koyama, Kazuya3; Llinares, Claudio1; Zhao, Gong-Bo3,5
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| 刊名 | JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
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| 出版日期 | 2017-02-01 |
| 期号 | 2 |
| 关键词 | cosmological simulations dark matter simulations modified gravity |
| 英文摘要 | We describe and demonstrate the potential of a new and very efficient method for simulating certain classes of modified gravity theories, such as the widely studied f(R) gravity models. High resolution simulations for such models are currently very slow due to the highly nonlinear partial differential equation that needs to be solved exactly to predict the modified gravitational force. This nonlinearity is partly inherent, but is also exacerbated by the specific numerical algorithm used, which employs a variable redefinition to prevent numerical instabilities. The standard Newton-Gauss-Seidel iterative method used to tackle this problem has a poor convergence rate. Our new method not only avoids this, but also allows the discretised equation to be written in a form that is analytically solvable. We show that this new method greatly improves the performance and efficiency of f(R) simulations. For example, a test simulation with 512(3) particles in a box of size 512 Mpc/h is now 5 times faster than before, while a Millennium-resolution simulation for f(R) gravity is estimated to be more than 20 times faster than with the old method. Our new implementation will be particularly useful for running very high resolution, large-sized simulations which, to date, are only possible for the standard model, and also makes it feasible to run large numbers of lower resolution simulations for covariance analyses. We hope that the method will bring us to a new era for precision cosmological tests of gravity. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics ; Physics, Particles & Fields |
| 研究领域[WOS] | Astronomy & Astrophysics ; Physics |
| 关键词[WOS] | F(R) GRAVITY ; HUBBLE CONSTANT ; POWER SPECTRA ; DARK ENERGY ; LOCAL GROUP ; GALAXIES ; SPACE ; CODE ; CONSTRAINTS ; COSMOLOGY |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000399455000050 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/8388]  |
| 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.Max Planck Inst Astrophys, Karl Schwarzschild Str 1, D-85741 Garching, Germany 3.Univ Portsmouth, Inst Cosmol & Gravitat, Portsmouth PO1 3FX, Hants, England 4.Univ Zielona Gora, Janusz Gil Inst Astron, Ul Szafrana 2, PL-65516 Zielona Gora, Poland 5.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China |
| 推荐引用方式 GB/T 7714 | Bose, Sownak,Li, Baojiu,Barreira, Alexandre,et al. Speeding up N-body simulations of modified gravity: chameleon screening models[J]. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS,2017(2). |
| APA | Bose, Sownak.,Li, Baojiu.,Barreira, Alexandre.,He, Jian-hua.,Hellwing, Wojciech A..,...&Zhao, Gong-Bo.(2017).Speeding up N-body simulations of modified gravity: chameleon screening models.JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS(2). |
| MLA | Bose, Sownak,et al."Speeding up N-body simulations of modified gravity: chameleon screening models".JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS .2(2017). |
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来源：国家天文台
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