AI 中文总结
为应对宇宙常数理论挑战，探索动态暗能量和修正引力模型，介绍EFT-RAMSES代码，它将暗能量有效场论框架嵌入数值管道，整合多种理论到单一方程，通过N体模拟验证，为暗能量和修正引力精确宇宙学测试提供强大通用计算工具。
AI 中文摘要
虽然标准的ΛCDM范式与当前大多数宇宙学观测结果高度吻合，但围绕宇宙常数（Λ）的理论挑战促使人们探索动态暗能量（DE）和修正引力（MG）模型。研究宇宙加速的物理本质需要N体模拟来探测宇宙结构的非线性增长，并为第四阶段调查的高精度数据做准备。本文介绍了EFT-RAMSES，它是ECOSMOG宇宙学模拟代码的全面扩展，旨在探索DE和MG情景下的非线性结构形成。我们将暗能量有效场论（EFTofDE）框架嵌入这个新的数值管道，利用α基参数化提供一个通用的、与模型无关的计算引擎。通过将各种标量和矢量-张量理论——包括正常和自加速的Dvali-Gabadadze-Porrati（DGP）模型、立方伽利略子（立方标量伽利略子（csG）、立方矢量伽利略子（cvG）和广义立方协变伽利略子（GCCG））以及通用有效场论（EFT）参数化——整合到一个单一的“主”Vainshtein方程中，该管道无需特定于模型的求解器，并且可以轻松专门针对任何特定模型。作为验证，我们对正常分支DGP（nDGP）、csG、GCCG和EFT模型进行了高分辨率N体模拟，将得到的物质功率谱与诸如传统ECOSMOG和HiCOLA等依赖和独立代码以及线性理论进行比较，发现吻合度很高。EFT-RAMSES为使用即将到来的宇宙学调查对DE和MG进行精确宇宙学测试提供了一个强大且通用的计算工具。该代码可从GitHub的EFT-RAMSES存储库下载。
英文摘要
While the standard $Λ$CDM paradigm is in excellent agreement with most current cosmological observations, theoretical challenges surrounding the cosmological constant ($Λ$) have strongly motivated the exploration of dynamical dark energy (DE) and modified gravity (MG) models. Investigating the physical nature of the cosmic acceleration requires N-body simulations to probe the non-linear growth of cosmic structure and prepare for the high-precision data from Stage-IV surveys. In this paper, we present EFT-RAMSES, a comprehensive extension of the ECOSMOG cosmological simulation code designed to explore non-linear structure formation in DE and MG scenarios. We embed the effective field theory of dark energy (EFTofDE) framework into this new numerical pipeline, utilising the $α$-basis parameterisation to provide a versatile, model-agnostic, computational engine. By consolidating diverse scalar and vector-tensor theories---including the normal and self-accelerating Dvali-Gabadadze-Porrati (DGP) models, cubic Galileons (cubic scalar Galileon (csG), cubic vector Galileon (cvG) and generalised cubic covariant Galileon (GCCG)), and generic effective field theory (EFT) parameterisation---into a single "master" Vainshtein equation, this pipeline bypasses the need for model-specific solvers and easily specialises to any particular model. As validations, we perform high-resolution N-body simulations for the normal-branch DGP (nDGP), csG, GCCG, and EFT models, comparing the resulting matter power spectra against dependent and independent codes such as legacy ECOSMOG and HiCOLA, as well as linear theory, and find excellent agreement. EFT-RAMSES provides a robust and versatile computational tool for precision cosmological tests of DE and MG using upcoming cosmological surveys. The code is available for download from the GitHub EFT-RAMSES repository.
Comments18 pages, 5 figures (2 more in an Appendix), submitted to MNRAS; comments welcome
