首页|(DarkAI)Mapping the large-scale density field of dark matter using artificial intelligence

(DarkAI)Mapping the large-scale density field of dark matter using artificial intelligence

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Herein,we present a deep-learning technique for reconstructing the dark-matter density field from the redshift-space distribution of dark-matter halos.We built a UNet-architecture neural network and trained it using the COmoving Lagrangian Acceleration fast simulation,which is an approximation of the N-body simulation with 5123 particles in a box size of 500h-1Mpc.Further,we tested the resulting UNet model not only with training-like test samples but also with standard N-body simulations,such as the Jiutian simulation with 61443 particles in a box size of 1000 h-1Mpc and the ELUCID simulation,which has a different cosmol-ogy.The real-space dark-matter density fields in the three simulations can be reconstructed reliably with only a small reduction of the cross-correlation power spectrum at 1％ and 10％ levels at k=0.1 and 0.3 h Mpc-1,respectively.The reconstruction clearly helps to correct for redshift-space distortions and is unaffected by the different cosmologies between the training(Planck2018)and test samples(WMAP5).Furthermore,we tested the application of the UNet-reconstructed density field to obtain the velocity & tidal field and found that this approach provides better results compared with the traditional approach based on the linear bias model,showing a 12.2％improvement in the correlation slope and a 21.1％reduction in the scatter between the predicted and true velocities.Thus,our method is highly efficient and has excellent extrapolation reliability beyond the training set.This provides an ideal solution for determining the three-dimensional underlying density field from the plentiful galaxy survey data.

dark matterlarge-scale structurecosmology

Zitong Wang、Feng Shi、Xiaohu Yang、Qingyang Li、Yanming Liu、Xiaoping Li

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School of Aerospace Science and Technology,Xidian University,Xi'an 710126,China

Department of Astronomy,School of Physics and Astronomy,and Shanghai Key Laboratory for Particle Physics and Cosmology,Shanghai Jiao Tong University,Shanghai 200240,China

Tsung-Dao Lee Institute and Key Laboratory for Particle Physics,Astrophysics and Cosmology,Ministry of Education,Shanghai Jiao Tong University,Shanghai 200240,China

Institute for Astronomy,University of Edinburgh,Royal Observatory,Edinburgh EH9 3HJ,United Kingdom

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National SKA Program of ChinaNational SKA Program of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of China111 ProjectShanghai Natural Science FoundationScience Research grants from the China Manned Space ProjectFundamental Research Funds for the Central UniversitiesHigh-Petformance Computing Platform of Xidian University

2022SKA01102002022SKA0110202121030371183300511890692B2001919ZR1466800CMS-CSST-2021-A02XJS221312

2024

10.1007/s11433-023-2192-9

中国科学:物理学 力学 天文学(英文版)
中国科学院

中国科学:物理学 力学 天文学(英文版)

CSTPCD
影响因子：0.91
ISSN：1674-7348
年,卷(期)：2024.67(1)
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