Constraining the growth rate on linear scales by combining SKAO and DESI surveys
Abstract In the pursuit of understanding the large-scale structure of the Universe, the synergy between complementary cosmological surveys has proven to be a powerful tool. Using multiple tracers of the large-scale structure can significantly improve the constraints on cosmological parameters. We ex...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2024-01-01
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| Series: | European Physical Journal C: Particles and Fields |
| Online Access: | https://doi.org/10.1140/epjc/s10052-024-12467-5 |
| _version_ | 1797233348293165056 |
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| author | Simthembile Dlamini Sheean Jolicoeur Roy Maartens |
| author_facet | Simthembile Dlamini Sheean Jolicoeur Roy Maartens |
| author_sort | Simthembile Dlamini |
| collection | DOAJ |
| description | Abstract In the pursuit of understanding the large-scale structure of the Universe, the synergy between complementary cosmological surveys has proven to be a powerful tool. Using multiple tracers of the large-scale structure can significantly improve the constraints on cosmological parameters. We explore the potential of combining the Square Kilometre Array Observatory (SKAO) and the Dark Energy Spectroscopic Instrument (DESI) spectroscopic surveys to enhance precision on the growth rate of cosmic structures. We employ a multi-tracer Fisher analysis to estimate precision on the growth rate when using pairs of mock surveys that are based on SKAO and DESI specifications. The pairs are at both low and high redshifts. For SKA-MID, we use the HI galaxy and the HI intensity mapping samples. In order to avoid the complexities and uncertainties at small scales, we confine the analysis to scales where linear perturbations are reliable. The consequent loss of signal in each individual survey is mitigated by the gains from the multi-tracer. After marginalising over cosmological and nuisance parameters, we find a significant improvement in the precision on the growth rate. |
| first_indexed | 2024-03-07T14:45:02Z |
| format | Article |
| id | doaj.art-bd7d8327faaa424cbaad8c4ab77ddf0e |
| institution | Directory Open Access Journal |
| issn | 1434-6052 |
| language | English |
| last_indexed | 2024-04-24T16:14:44Z |
| publishDate | 2024-01-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | European Physical Journal C: Particles and Fields |
| spelling | doaj.art-bd7d8327faaa424cbaad8c4ab77ddf0e2024-03-31T11:32:40ZengSpringerOpenEuropean Physical Journal C: Particles and Fields1434-60522024-01-0184111110.1140/epjc/s10052-024-12467-5Constraining the growth rate on linear scales by combining SKAO and DESI surveysSimthembile Dlamini0Sheean Jolicoeur1Roy Maartens2Department of Physics and Astronomy, University of the Western CapeDepartment of Physics and Astronomy, University of the Western CapeDepartment of Physics and Astronomy, University of the Western CapeAbstract In the pursuit of understanding the large-scale structure of the Universe, the synergy between complementary cosmological surveys has proven to be a powerful tool. Using multiple tracers of the large-scale structure can significantly improve the constraints on cosmological parameters. We explore the potential of combining the Square Kilometre Array Observatory (SKAO) and the Dark Energy Spectroscopic Instrument (DESI) spectroscopic surveys to enhance precision on the growth rate of cosmic structures. We employ a multi-tracer Fisher analysis to estimate precision on the growth rate when using pairs of mock surveys that are based on SKAO and DESI specifications. The pairs are at both low and high redshifts. For SKA-MID, we use the HI galaxy and the HI intensity mapping samples. In order to avoid the complexities and uncertainties at small scales, we confine the analysis to scales where linear perturbations are reliable. The consequent loss of signal in each individual survey is mitigated by the gains from the multi-tracer. After marginalising over cosmological and nuisance parameters, we find a significant improvement in the precision on the growth rate.https://doi.org/10.1140/epjc/s10052-024-12467-5 |
| spellingShingle | Simthembile Dlamini Sheean Jolicoeur Roy Maartens Constraining the growth rate on linear scales by combining SKAO and DESI surveys European Physical Journal C: Particles and Fields |
| title | Constraining the growth rate on linear scales by combining SKAO and DESI surveys |
| title_full | Constraining the growth rate on linear scales by combining SKAO and DESI surveys |
| title_fullStr | Constraining the growth rate on linear scales by combining SKAO and DESI surveys |
| title_full_unstemmed | Constraining the growth rate on linear scales by combining SKAO and DESI surveys |
| title_short | Constraining the growth rate on linear scales by combining SKAO and DESI surveys |
| title_sort | constraining the growth rate on linear scales by combining skao and desi surveys |
| url | https://doi.org/10.1140/epjc/s10052-024-12467-5 |
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