COLA with scale-dependent growth: applications to screened modified gravity models
COLA with scale-dependent growth: applications to screened modified gravity models
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DOI：
10.1088/1475-7516/2017/08/006
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发表时间：
2017-03
影响因子：
6.4
通讯作者：
H. Winther;K. Koyama;M. Manera;B. S. Wright;Gong-Bo Zhao
中科院分区：
文献类型：
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作者：
H. Winther;K. Koyama;M. Manera;B. S. Wright;Gong-Bo Zhao
我们提出了一种通用的并行且易于使用的代码，使用 COLA（COmoving Lagrangian Acceleration）方法对宇宙学模型进行结构形成的数值模拟，该模型在一阶和二阶拉格朗日微扰理论水平上表现出尺度相关的增长。对于修正的重力理论，我们还包括使用快速近似方法的筛选，该方法涵盖了文献中筛选机制的所有主要示例。我们通过将代码与两种流行的修正重力模型（即 f(R) 重力和 nDGP）的完整模拟进行比较来测试代码，并发现即使使用相当少量的 COLA 时间步长，修正重力提升因子相对于 ΛCDM 也具有良好的一致性。
We present a general parallelized and easy-to-use code to perform numerical simulations of structure formation using the COLA (COmoving Lagrangian Acceleration) method for cosmological models that exhibit scale-dependent growth at the level of first and second order Lagrangian perturbation theory. For modified gravity theories we also include screening using a fast approximate method that covers all the main examples of screening mechanisms in the literature. We test the code by comparing it to full simulations of two popular modified gravity models, namely f(R) gravity and nDGP, and find good agreement in the modified gravity boost-factors relative to ΛCDM even when using a fairly small number of COLA time steps.