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research article

A machine learning approach to correct for mass resolution effects in simulated halo clustering statistics

Forero-Sanchez, Daniel  
•
Chuang, Chia-Hsun
•
Rodriguez-Torres, Sergio
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May 18, 2022
Monthly Notices Of The Royal Astronomical Society

The increase in the observed volume in cosmological surveys imposes various challenges on simulation preparations. First, the volume of the simulations required increases proportionally to the observations. However, large-volume simulations are quickly becoming computationally intractable. Secondly, on-going and future large-volume survey are targeting smaller objects, e.g. emission line galaxies, compared to the earlier focus, i.e. luminous red galaxies. They require the simulations to have higher mass resolutions. In this work, we present a machine learning (ML) approach to calibrate the halo catalogue of a low-resolution (LR) simulation by training with a paired high-resolution (IIR) simulation with the same background white noise, thus we can build the training data by matching HR haloes to LR haloes in a one-to-one fashion. After training, the calibrated LR halo catalogue reproduces the mass-clustering relation for mass down to 2.5 x 10(11) h(-1) M-circle dot within 5 per cent at scales k < 1 h Mpc(-1). We validate the performance of different statistics including halo mass function, power spectrum, two-point correlation function, and bispectrum in both real and redshift space. Our approach generates I IR-like halo catalogues (>200 particles per halo) from LR catalogues (>25 particles per halo) containing corrected halo masses for each object. This allows to bypass the computational burden of a large-volume real high-resolution simulation without much compromise in the mass resolution of the result. The cost of our ML approach (similar to 1 CPU-h) is negligible compared to the cost of a N-body simulation (e.g. millions of CPU-h), The required computing time is cut a factor of 8.

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Type
research article
DOI
10.1093/mnras/stac1239
Web of Science ID

WOS:000797193800009

Author(s)
Forero-Sanchez, Daniel  
Chuang, Chia-Hsun
Rodriguez-Torres, Sergio
Yepes, Gustavo
Gottloeber, Stefan
Zhao, Cheng  
Date Issued

2022-05-18

Publisher

OXFORD UNIV PRESS

Published in
Monthly Notices Of The Royal Astronomical Society
Volume

513

Issue

3

Start page

4318

End page

4331

Subjects

Astronomy & Astrophysics

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methods: data analysis

•

methods: statistical

•

large-scale structure of universe

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dark-matter

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spectroscopic surveys

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code

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reconstruction

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galaxies

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scheme

•

bias

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LASTRO  
Available on Infoscience
June 6, 2022
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/188367
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