Cosmological Remapping for Efficient Generation of 21 cm Intensity Mapping Mocks
Rahima Mokeddem, Bruno B. Bizarria, Jiajun Zhang, W.S. Hip\'olito-Ricaldi, Carlos Alexandre Wuensche, Elcio Abdalla, Filipe B. Abdalla, Amilcar R. Queiroz, Thyrso Villela, Bin Wang, Chang Feng, Edmar C. Gurj\~ao, Alessandro Marins

TL;DR
This paper introduces a cosmological remapping technique to efficiently generate 21 cm intensity mapping simulations across different cosmologies, reducing computational costs for large-scale structure studies.
Contribution
The authors develop and validate a remapping method that rescales existing simulations to produce accurate 21 cm mocks for various cosmologies, streamlining simulation workflows.
Findings
Remapping accurately reproduces 21 cm maps for different cosmologies.
The method reduces computational resources compared to full N-body simulations.
Limitations depend on halo mass thresholds and rescaling parameters.
Abstract
We present a novel application of cosmological rescaling, or "remapping," to generate 21 cm intensity mapping mocks for different cosmologies. The remapping method allows for computationally efficient generation of N-body catalogs by rescaling existing simulations. In this work, we employ the remapping method to construct dark matter halo catalogs, starting from the Horizon Run 4 simulation with WMAP5 cosmology, and apply it to different target cosmologies, including WMAP7, Planck18 and Chevallier-Polarski-Linder (CPL) models. These catalogs are then used to simulate 21 cm intensity maps. We use the halo occupation distribution (HOD) method to populate halos with neutral hydrogen (HI) and derive 21 cm brightness temperature maps. Our results demonstrate the effectiveness of the remapping approach in generating cosmological simulations for large-scale structure studies, offering an…
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.
Taxonomy
TopicsGalaxies: Formation, Evolution, Phenomena · Cosmology and Gravitation Theories · Astronomy and Astrophysical Research
