$\texttt{Hi-COLA}$：Horndeski引力中结构形成的快速近似模拟
$\texttt{Hi-COLA}$: Fast, approximate simulations of structure formation in Horndeski gravity
摘要：
我们介绍了$\texttt{Hi-COLA}$，一个代码，旨在运行快速，近似$\textit{N}$体模拟的非线性结构形成减少Horndeski重力。给定一个输入拉格朗日量，$\texttt{Hi-COLA}$动态地构造适当的场方程，并一致地求解该理论的宇宙学背景、线性增长和屏蔽的第五种力。因此，$\texttt{Hi-COLA}$是一个通用的，适应性强，有用的工具，允许温和的非线性政权的许多Horndeski理论进行调查的第一次，在低计算成本。在这项工作中，我们首先描述的筛选近似和模拟设置的$\texttt{Hi-COLA}$的理论与Vainshtein筛选。我们验证了传统的$\textit{N}$体模拟立方Galileon重力的代码，发现$2.5\%$协议高达$k_{\rm max}=1.2~h/{\rm Mpc}$。为了证明$\texttt{Hi-COLA}$的灵活性，我们还运行了扩展的移位对称引力理论的第一次模拟。我们使用$\texttt{Hi-COLA}$的一致性和模块性来剖析修改后的背景、线性增长和筛选后的第五种力是如何在非线性物质功率谱中导致偏离$Λ$ CDM的。$\texttt{Hi-COLA}$可在https://github.com/Hi-COLACode/Hi-COLA上找到。
英文摘要：
We introduce $\texttt{Hi-COLA}$, a code designed to run fast, approximate $\textit{N}$-body simulations of non-linear structure formation in reduced Horndeski gravity. Given an input Lagrangian, $\texttt{Hi-COLA}$ dynamically constructs the appropriate field equations and consistently solves for the cosmological background, linear growth, and screened fifth force of that theory. Hence $\texttt{Hi-COLA}$ is a general, adaptable, and useful tool that allows the mildly non-linear regime of many Horndeski theories to be investigated for the first time, at low computational cost. In this work, we first describe the screening approximations and simulation setup of $\texttt{Hi-COLA}$ for theories with Vainshtein screening. We validate the code against traditional $\textit{N}$-body simulations for cubic Galileon gravity, finding $2.5\%$ agreement up to $k_{\rm max}=1.2~h/{\rm Mpc}$. To demonstrate the flexibility of $\texttt{Hi-COLA}$, we additionally run the first simulations of an extended shift-symmetric gravity theory. We use the consistency and modularity of $\texttt{Hi-COLA}$ to dissect how the modified background, linear growth, and screened fifth force all contribute to departures from $Λ$CDM in the non-linear matter power spectrum. $\texttt{Hi-COLA}$ can be found at https://github.com/Hi-COLACode/Hi-COLA .
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