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| Autori principali: | , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| Soggetti: | |
| Accesso online: | https://arxiv.org/abs/2509.19514 |
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| _version_ | 1866911173049319424 |
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| author | Leung, Calvin Borrow, Josh Masui, Kiyoshi W. Andrew, Shion Chen, Kai-Feng Schaye, Joop Schaller, Matthieu |
| author_facet | Leung, Calvin Borrow, Josh Masui, Kiyoshi W. Andrew, Shion Chen, Kai-Feng Schaye, Joop Schaller, Matthieu |
| contents | Baryonic feedback is a leading contaminant in studying dark matter and cosmology using cosmic shear. This has meant omitting much of the data during cosmological inference, or forward-modeling the spatial distribution of gas around dark matter halos using analytical or hydrodynamical models for baryonic feedback, which introduces nuisance parameters and model dependence. We propose a novel method of ``baryon nulling'' using cross-correlations between shear maps and fast radio burst (FRB) dispersion measures. By directly subtracting the dark matter--dispersion measure cross-correlation, the sensitivity of our nulled power spectra to feedback effects can be significantly reduced without any explicit feedback modeling. Using the FLAMINGO suite of hydrodynamic simulations, whose power spectra span a wide yet realistic range of feedback variations, we demonstrate that our method reduces sensitivity to feedback modeling at $k \approx 1$ Mpc$^{-1}$ by about an order of magnitude. This points toward a strong synergy between the next generation of sensitive FRB surveys such as CHORD and the DSA-2000, and cosmic shear surveys such as Rubin, Euclid, and Roman. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_19514 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Nulling baryonic feedback in weak lensing surveys using cross-correlations with fast radio bursts Leung, Calvin Borrow, Josh Masui, Kiyoshi W. Andrew, Shion Chen, Kai-Feng Schaye, Joop Schaller, Matthieu Cosmology and Nongalactic Astrophysics High Energy Astrophysical Phenomena Baryonic feedback is a leading contaminant in studying dark matter and cosmology using cosmic shear. This has meant omitting much of the data during cosmological inference, or forward-modeling the spatial distribution of gas around dark matter halos using analytical or hydrodynamical models for baryonic feedback, which introduces nuisance parameters and model dependence. We propose a novel method of ``baryon nulling'' using cross-correlations between shear maps and fast radio burst (FRB) dispersion measures. By directly subtracting the dark matter--dispersion measure cross-correlation, the sensitivity of our nulled power spectra to feedback effects can be significantly reduced without any explicit feedback modeling. Using the FLAMINGO suite of hydrodynamic simulations, whose power spectra span a wide yet realistic range of feedback variations, we demonstrate that our method reduces sensitivity to feedback modeling at $k \approx 1$ Mpc$^{-1}$ by about an order of magnitude. This points toward a strong synergy between the next generation of sensitive FRB surveys such as CHORD and the DSA-2000, and cosmic shear surveys such as Rubin, Euclid, and Roman. |
| title | Nulling baryonic feedback in weak lensing surveys using cross-correlations with fast radio bursts |
| topic | Cosmology and Nongalactic Astrophysics High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2509.19514 |