forge : the f ( R )-gravity cosmic emulator project - I. Introduction and matter power spectrum emulator
forge : the f ( R )-gravity cosmic emulator project - I. Introduction and matter power spectrum emulator
复制标题
forge : f(R)-引力宇宙模拟器项目 - I. 简介和物质功率谱模拟器
DOI：
10.1093/mnras/stac1091
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发表时间：
2022
影响因子：
4.8
通讯作者：
Arnold C
中科院分区：
文献类型：
--
作者：
Arnold C
我们提出了一个大型的宇宙学模拟套件，forge（F-of-R重力模拟器）仿真套件，它旨在为星系团，弱引力透镜和星系团中的宇宙学观测建立精确的模拟器，用于f(R)-重力模型。总共有200次模拟探索了标准普朗克宇宙学周围的宇宙学参数空间，其中有50种组合，Ωm, σ8，所有其他参数都是固定的。对于每个参数组合或节点，我们运行了四个独立的模拟，一对在模拟盒中使用10243个粒子来覆盖小尺度，另一对使用5123个模拟粒子收件箱来覆盖更大的尺度。选取每一对初始条件，使大尺度上的样本方差平均最小。在这项工作中，我们提出了一个精确的模拟器，用于训练在forge上的物质功率谱inf(R)重力。我们已经验证，使用交叉验证技术，仿真器的精度优于大多数节点，特别是围绕探索参数空间的中心，达到规模。我们还将功率谱模拟器与不属于我们训练集的模拟进行了对比，并发现了非常好的一致性。由于其在小尺度上的高精度，锻造物功率谱模拟器非常适合于弱透镜分析，并且可以利用当前和未来的观测数据在约束f(R)重力方面发挥关键作用。
We present a large suite of cosmological simulations, theforge(F-of-R Gravity Emulator) simulation suite, which is designed to build accurate emulators for cosmological observables in galaxy clustering, weak gravitational lensing, and galaxy clusters for thef(R)-gravity model. A total of 200 simulations explore the cosmological parameter space around a standard Planck cosmology with a Latin hypercube, for 50 combinations of, Ωm, σ8, andhwith all other parameters fixed. For each parameter combination, or node, we ran four independent simulations, one pair using 10243particles insimulation boxes to cover small scales, and another pair using 5123simulation particles inboxes for larger scales. Each pair of initial conditions is selected such that sample variance on large scales is minimized on average. In this work we present an accurate emulator for the matter power spectrum inf(R) gravity trained onforge. We have verified, using the cross-validation technique, that the emulator accuracy is better thanfor the majority of nodes, particularly around the centre of the explored parameter space, up to scales of. We have also checked the power spectrum emulator against simulations that are not part of our training set and found excellent agreement. Due to its high accuracy on small scales, theforgematter power spectrum emulator is well suited for weak-lensing analysis and can play a key tool in constrainingf(R) gravity using current and future observational data.