Unveiling the dark Universe with HI and EMBER-2
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arXiv
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| Autori principali: | , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| author | Bernardini, Mauro Feldmann, Robert Anglés-Alcázar, Daniel Denzel, Philipp Gensior, Jindra |
| author_facet | Bernardini, Mauro Feldmann, Robert Anglés-Alcázar, Daniel Denzel, Philipp Gensior, Jindra |
| contents | Next-generation radio telescopes will provide unprecedented data volumes of the neutral hydrogen (HI) distribution across cosmic time. The spatial and kinematic distribution of HI is a biased tracer of the underlying matter field, and as such contains information on the distribution of dark matter over a wide range of scales. Extracting dark matter properties from HI, however, is non-trivial because baryonic processes linked to galaxy formation significantly modify the HI distribution. Additionally, methods that use empirical relations, often calibrated via numerical simulations, do not use the full field-level information to model the complex relation between HI and dark matter. We use the recently introduced EMBER-2 model to directly predict dark matter distributions from HI tracers over a wide redshift range, z=0-6. After training on cosmological galaxy formation simulations run with FIRE-2, our method accurately recovers key statistics, including dark matter mass fractions, surface density profiles and cross-correlations, where the latter are reconstructed at an accuracy of 20% down to scales of k = 100 h/cMpc constituting a significant improvement over traditional approaches. The presented method may become a key ingredient in future inference pipelines as it can be readily integrated into downstream analysis tasks of radio surveys. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_05339 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Unveiling the dark Universe with HI and EMBER-2 Bernardini, Mauro Feldmann, Robert Anglés-Alcázar, Daniel Denzel, Philipp Gensior, Jindra Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies Next-generation radio telescopes will provide unprecedented data volumes of the neutral hydrogen (HI) distribution across cosmic time. The spatial and kinematic distribution of HI is a biased tracer of the underlying matter field, and as such contains information on the distribution of dark matter over a wide range of scales. Extracting dark matter properties from HI, however, is non-trivial because baryonic processes linked to galaxy formation significantly modify the HI distribution. Additionally, methods that use empirical relations, often calibrated via numerical simulations, do not use the full field-level information to model the complex relation between HI and dark matter. We use the recently introduced EMBER-2 model to directly predict dark matter distributions from HI tracers over a wide redshift range, z=0-6. After training on cosmological galaxy formation simulations run with FIRE-2, our method accurately recovers key statistics, including dark matter mass fractions, surface density profiles and cross-correlations, where the latter are reconstructed at an accuracy of 20% down to scales of k = 100 h/cMpc constituting a significant improvement over traditional approaches. The presented method may become a key ingredient in future inference pipelines as it can be readily integrated into downstream analysis tasks of radio surveys. |
| title | Unveiling the dark Universe with HI and EMBER-2 |
| topic | Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2507.05339 |