为了在宇宙学尺度上探测引力修正,需要精确的理论预测。N体模拟对于探索结构形成的非线性区域是必需的,但非常耗时。在这项工作中,我们发布了一个新的公开仿真器,名为e-MANTIS,它在使用ECOSMOG运行的f(R)修正引力宇宙学模拟的预测之间执行精确且快速的插值。我们对一个宽广的三维参数空间进行采样,该参数空间由当前背景标量场值$10^{-7}<\left|f_{R_0}\right|<10^{-4}$、物质密度$0.24<Ω_\mathrm{m}<0.39$以及原初功率谱归一化$0.6<σ_8<1.0$给出,使用拉丁超立方采样了110个点。对于每个模型,我们执行成对的f(R)CDM和ΛCDM模拟,覆盖有效体积为$\left(560 \\, h^{-1}\mathrm{Mpc}\right)^3$,质量分辨率约为$\sim 2 \times 10^{10} h^{-1} M_\odot$。我们使用高斯过程回归方法为物质功率谱增强因子$B(k)=P_{f(R)}(k)/P_{Λ\mathrm{CDM}}(k)$构建仿真器。该增强因子在很大程度上独立于$h$、$n_{s}$和$Ω_{b}$,这降低了相关宇宙学参数空间的维度。此外,它比原始功率谱对统计误差和系统误差更具鲁棒性,从而大大减少了我们的计算需求。根据我们对数值系统误差的专门研究,所得仿真器在整个宇宙学参数空间内,对于尺度$0.03 \\ h\mathrm{Mpc}^{-1} < k < 7 \\ h\mathrm{Mpc}^{-1}$和红移$0 < z < 2$,估计最大误差为$3\\%$,而在大多数情况下精度优于$1\\%$。这样的仿真器可用于通过弱引力透镜分析来约束f(R)引力。
英文摘要:
In order to probe modifications of gravity at cosmological scales, one needs accurate theoretical predictions. N-body simulations are required to explore the non-linear regime of structure formation but are very time consuming. In this work, we release a new public emulator, dubbed e-MANTIS, that performs an accurate and fast interpolation between the predictions of $f(R)$ modified gravity cosmological simulations, run with ECOSMOG. We sample a wide 3D parameter space given by the current background scalar field value $10^{-7}<\left|f_{R_0}\right|<10^{-4}$, matter density $0.24<Ω_\mathrm{m}<0.39$, and primordial power spectrum normalisation $0.6<σ_8<1.0$, with 110 points sampled from a Latin Hypercube. For each model we perform pairs of $f(R)$CDM and $Λ$CDM simulations covering an effective volume of $\left(560 \, h^{-1}\mathrm{Mpc}\right)^3$ with a mass resolution of $\sim 2 \times 10^{10} h^{-1} M_\odot$. We build an emulator for the matter power spectrum boost $B(k)=P_{f(R)}(k)/P_{Λ\mathrm{CDM}}(k)$ using a Gaussian Process Regression method. The boost is mostly independent of $h$, $n_{s}$, and $Ω_{b}$, which reduces the dimensionality of the relevant cosmological parameter space. Additionally, it is more robust against statistical and systematic errors than the raw power spectrum, thus strongly reducing our computational needs. According to our dedicated study of numerical systematics, the resulting emulator has an estimated maximum error of $3\%$ across the whole cosmological parameter space, for scales $0.03 \ h\mathrm{Mpc}^{-1} < k < 7 \ h\mathrm{Mpc}^{-1}$, and redshifts $0 < z < 2$, while in most cases the accuracy is better than $1\%$. Such an emulator could be used to constrain $f(R)$ gravity with weak lensing analyses
Modeling nonlinear scales for dynamical dark energy cosmologies with COLA
CBPF - Brazilian Center for Research in Physics(巴西物理研究中心);Instituto de Física Teórica da Universidade Estadual Paulista(圣保罗州立大学理论物理研究所);Department of Physics & Astronomy, Stony Brook University(石溪大学物理与天文学系);C. N. Yang Institute for Theoretical Physics, Stony Brook University(石溪大学陈省身理论物理研究所)
$\texttt{SPINE}$: Symbolic Models to Predict the Evolution of the $Λ$CDM Nonlinear Power Spectrum
University of Hull(赫尔大学);E. A. Milne Centre for Astrophysics, University of Hull(赫尔大学 E. A. 米尔内天体物理中心);Centre of Excellence for Data Science, AI, & Modelling (DAIM), University of Hull(赫尔大学数据科学、人工智能与建模卓越中心);Max-Planck-Institut für extraterrestrische Physik(马克斯·普朗克地外物理研究所);Universitäts-Sternwarte München(慕尼黑大学天文台);Newcastle University(纽卡斯尔大学)
该研究提出SPINE和SPINEX两个分析模拟器,基于符号回归技术,可在0.01-2 h Mpc⁻¹波数范围内高精度预测ΛCDM非线性功率谱,精度优于5%,为宇宙学功率谱建模提供高效可解释的替代方案。
Aletheia: Emulating the halo mass function with evolution mapping
Max-Planck-Institut für extraterrestrische Physik(马克斯·普朗克地外物理研究所);Ludwig-Maximilians-Universität München(慕尼黑大学);Instituto de Astronomía Teórica y Experimental, CONICET-UNC(理论与实验天文学研究所,阿根廷国家科学研究委员会-科尔多瓦大学);Universidad Nacional de Córdoba(科尔多瓦国立大学)
CMBolic: Symbolic emulators for the Cosmic Microwave Background. I. Lensing
CEICO, Institute of Physics of the Czech Academy of Sciences(捷克科学院物理研究所);Institute of Theoretical Physics, Faculty of Mathematics and Physics, Charles University(查理大学数学物理学院理论物理研究所);Astrophysics, University of Oxford(牛津大学天体物理学系);Institute of Cosmology & Gravitation, University of Portsmouth(朴茨茅斯大学宇宙学与引力研究所)
Nonlinear Information from DESI Luminous Red Galaxies: An Emulator-Based Analysis of Pre- and Post-Reconstruction Power Spectra
National Astronomical Observatories, Chinese Academy of Sciences(中国科学院国家天文台);School of Astronomy and Space Science, University of Chinese Academy of Sciences(中国科学院大学天文与空间科学学院);Institute of Cosmology and Gravitation, University of Portsmouth(朴茨茅斯大学宇宙学与引力研究所);Kavli IPMU (WPI), UTIAS, The University of Tokyo(东京大学 Kavli宇宙起源与演化研究集成机构(WPI));Yukawa Institute for Theoretical Physics, Kyoto University(京都大学汤川理论物理研究所);Department of Astrophysics and Atmospheric Sciences, Faculty of Science, Kyoto Sangyo University(京都产业大学理学部天体物理学与大气科学系);Center for Gravitational Physics and Quantum Information, Yukawa Institute for Theoretical Physics, Kyoto University(京都大学汤川理论物理研究所引力物理与量子信息研究中心);Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study (UTIAS), The University of Tokyo(东京大学前沿研究机构 UTIAS 宇宙物理数学 Kavli研究所(WPI))
Ten-dimensional neural network emulator for the nonlinear matter power spectrum
Department of Physics & Astronomy, University of California, Riverside(加州大学河滨分校物理与天文系);Department of Physics, University of Michigan(密歇根大学物理系);The University of Texas at Austin(德克萨斯大学奥斯汀分校)
Field Level Neural Network Emulator for Cosmological N-body Simulations
Max-Planck-Institut für Astrophysik(马克斯·普朗克天体物理研究所);Stony Brook University(石溪大学);Flatiron Institute(熨斗研究所);Universidade Federal do Espírito Santo(圣埃斯皮里图联邦大学);Princeton University(普林斯顿大学);Simons Foundation(西蒙斯基金会)
Observational Insights on DBI K-essence Models Using Machine Learning and Bayesian Analysis
University of Calcutta(加尔各答大学);Haldia Government College(霍尔迪亚政府学院);K. J. Somaiya College of Science and Commerce(K.J. 索马亚科学与商业学院);Ben-Gurion University of the Negev(内盖夫本-古里安大学);Frankfurt Institute for Advanced Studies (FIAS)(法兰克福高等研究所);Bahamas Advanced Study Institute and Conferences(巴哈马高级研究院与会议);Sister Nivedita University(尼维迪塔姐妹大学);Prabhat Kumar College(普拉巴特·库马尔学院);Institute of Astronomy, Space and Earth Science(天文学、空间与地球科学研究院)
Gaussian-Process Emulation of the Redshift-Space Halo Power Spectrum Monopole in Cosmologies with Massive Neutrinos
National Astronomical Observatories, Chinese Academy of Sciences(中国科学院国家天文台);School of Astronomy and Space Science, University of Chinese Academy of Sciences(中国科学院大学天文与空间科学学院);Institute for Frontiers in Astronomy and Astrophysics, Beijing Normal University(北京师范大学天文与前沿科学研究院);Chinese Academy of Sciences South America Center for Astronomy (CASSACA), National Astronomical Observatories, Chinese Academy of Sciences(中国科学院南美天文中心)
Dark Quest II: A Wide-Coverage Neural Network Emulator of the Nonlinear Matter Power Spectrum Across Extended Cosmologies
Graduate School of Social Data Science, Hitotsubashi University(立命馆大学社会科学数据科学研究生院);Center for Gravitational Physics and Quantum Information, Yukawa Institute for Theoretical Physics, Kyoto University(京都大学重力物理与量子信息中心,山梨大学理论物理研究所);Department of Astrophysics and Atmospheric Sciences, Faculty of Science, Kyoto Sangyo University(京都 Sangyo 大学科学系天文学与大气科学系);Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study (UTIAS), The University of Tokyo(物理学与数学宇宙研究所(WPI),东京大学先进研究所(UTIAS),东京大学);RIKEN Center for Advanced Intelligence Project(理化学研究院先进智能项目中心)
Simulation budgeting for hybrid effective field theories
University of California, Berkeley(加州大学伯克利分校);Berkeley Center for Cosmological Physics, UC Berkeley(加州大学伯克利分校宇宙学物理中心);Lawrence Berkeley National Laboratory(劳伦斯伯克利国家实验室);Brookhaven National Laboratory(布鲁海文国家实验室)
The completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: measurement of the growth rate of structure from the small-scale clustering of the luminous red galaxy sample
MG-NECOLA: A Field-Level Emulator for $f(R)$ Gravity and Massive Neutrino Cosmologies
Universidad del Valle(谷大学);Michigan Technological University(密歇根理工大学);Università di Bologna(博洛尼亚大学);INAF, Osservatorio di Astrofisica e Scienza dello Spazio di Bologna(意大利国家天体物理研究所博洛尼亚天文与空间科学观测站)
Biased tracers, Hybrid Effective Field Theory and Modified Gravity
CBPF - Brazilian Center for Research in Physics(巴西物理研究中心);Institute for Computational Cosmology, Department of Physics, Durham University(杜伦大学);Institute of Cosmology and Gravitation, University of Portsmouth(朴茨茅斯大学);Kavli IPMU (WPI), UTIAS, The University of Tokyo(东京大学);Yukawa Institute for Theoretical Physics, Kyoto University(京都大学)
Full-shape cosmology analysis of SDSS-III BOSS galaxy power spectrum using emulator-based halo model: a $5\%$ determination of $σ_8$
对SDSS-Ⅲ BOSS DR 12星系表中的4个星系样本在$0.2 < z < 0.75$上进行了红移空间功率谱的全形宇宙学分析。对于理论模板,我们使用一个仿真器,这是建立在一个合奏集的$N$体模拟,这使得快速和准确的计算红移空间的功率谱晕。结合晕占据分布来模拟晕-星系的联系,我们可以在平坦的$Λ$ CDM宇宙学中计算类BOSS星系的红移空间功率谱。在我们的宇宙学推断中,我们使用功率谱图,四极和十六极,并包括7个讨厌的参数来模拟每个星系样本的晕星系连接的不确定性,但不使用任何信息的丰富的星系。我们证明了我们的分析管道使用模拟目录的BOSS-类星系,使用不同的配方的晕星系连接,包括组装偏置效应产生的验证。假设弱先验宇宙学参数,除了$Ω_{\rm b}h^2$和$n_{\rm s}$,我们表明,我们的模型很好地再现了BOSS功率谱。包括功率谱信息的$k_{\rm max}=0.25\,h{\rm Mpc}^{-1}$,我们发现$Ω_\mathrm{m}=0.301^{+0.012}_{-0.011}$,$H_0=68.2 \pm 1.4~\mathrm{km\,s}^{-1}\mathrm{Mpc}^{-1}$,和$σ_8=0.786^{+0.036}_{-0.037}$,为模式和68\%的可信区间,边缘化后的滋扰参数。我们发现,由于散粒噪声的支配和边缘化的晕星系连接参数的最大波长$…