Constraining primordial non-Gaussianity by combining next-generation galaxy and 21 cm intensity mapping surveys
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arXiv
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| Auteurs principaux: | , , |
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| Format: | Preprint |
| Publié: |
2023
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| _version_ | 1866917715679117312 |
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| author | Jolicoeur, Sheean Maartens, Roy Dlamini, Simthembile |
| author_facet | Jolicoeur, Sheean Maartens, Roy Dlamini, Simthembile |
| contents | Surveys of the matter distribution contain `fossil' information on possible non-Gaussianity that is generated in the primordial Universe. This primordial signal survives only on the largest scales where cosmic variance is strongest. By combining different surveys in a multi-tracer approach, we can suppress the cosmic variance and significantly improve the precision on the level of primordial non-Gaussianity. We consider a combination of an optical galaxy survey, like the recently initiated DESI survey, together with a new and very different type of survey, a 21 cm intensity mapping survey, like the upcoming SKAO survey. A Fisher forecast of the precision on the local primordial non-Gaussianity parameter $f_{\mathrm{NL}}$, shows that this multi-tracer combination, together with non-overlap single-tracer information, can deliver precision comparable to that from the CMB. Taking account of the largest systematic, i.e. foreground contamination in intensity mapping, we find that $σ(f_{\mathrm{NL}}) \sim 4$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2301_02406 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Constraining primordial non-Gaussianity by combining next-generation galaxy and 21 cm intensity mapping surveys Jolicoeur, Sheean Maartens, Roy Dlamini, Simthembile Cosmology and Nongalactic Astrophysics Surveys of the matter distribution contain `fossil' information on possible non-Gaussianity that is generated in the primordial Universe. This primordial signal survives only on the largest scales where cosmic variance is strongest. By combining different surveys in a multi-tracer approach, we can suppress the cosmic variance and significantly improve the precision on the level of primordial non-Gaussianity. We consider a combination of an optical galaxy survey, like the recently initiated DESI survey, together with a new and very different type of survey, a 21 cm intensity mapping survey, like the upcoming SKAO survey. A Fisher forecast of the precision on the local primordial non-Gaussianity parameter $f_{\mathrm{NL}}$, shows that this multi-tracer combination, together with non-overlap single-tracer information, can deliver precision comparable to that from the CMB. Taking account of the largest systematic, i.e. foreground contamination in intensity mapping, we find that $σ(f_{\mathrm{NL}}) \sim 4$. |
| title | Constraining primordial non-Gaussianity by combining next-generation galaxy and 21 cm intensity mapping surveys |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2301.02406 |