Starobinsky in Stereo: SKA-CMB Synergy in SBI
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| Format: | Preprint |
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2025
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| _version_ | 1866912540792979456 |
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| author | Schosser, Benedikt Heneka, Caroline Schäfer, Björn Malte |
| author_facet | Schosser, Benedikt Heneka, Caroline Schäfer, Björn Malte |
| contents | Modern machine learning techniques can unlock the vast cosmological information encoded in forthcoming Square Kilometre Array (SKA) observations. We show that tomographic 21 cm data from the reionisation era can yield stringent tests of inflationary models - here illustrated with Starobinsky $R+R^2$ inflation. Using a simulation-based inference (SBI) framework, we compare neural summaries (convolutional network and vision transformer) with a traditional power spectrum summary and perform a fully joint SBI analysis combining 21 cm data with data of the cosmic microwave background (CMB). Forecasts based on realistic mock observations indicate that SKA alone will achieve constraints competitive with Planck, and that the combined SKA + CMB dataset will tighten bounds on both inflationary and $Λ\mathrm{CDM}$ parameters considerably while improving precision on key astrophysical quantities. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2508_10094 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Starobinsky in Stereo: SKA-CMB Synergy in SBI Schosser, Benedikt Heneka, Caroline Schäfer, Björn Malte Cosmology and Nongalactic Astrophysics Instrumentation and Methods for Astrophysics Data Analysis, Statistics and Probability Modern machine learning techniques can unlock the vast cosmological information encoded in forthcoming Square Kilometre Array (SKA) observations. We show that tomographic 21 cm data from the reionisation era can yield stringent tests of inflationary models - here illustrated with Starobinsky $R+R^2$ inflation. Using a simulation-based inference (SBI) framework, we compare neural summaries (convolutional network and vision transformer) with a traditional power spectrum summary and perform a fully joint SBI analysis combining 21 cm data with data of the cosmic microwave background (CMB). Forecasts based on realistic mock observations indicate that SKA alone will achieve constraints competitive with Planck, and that the combined SKA + CMB dataset will tighten bounds on both inflationary and $Λ\mathrm{CDM}$ parameters considerably while improving precision on key astrophysical quantities. |
| title | Starobinsky in Stereo: SKA-CMB Synergy in SBI |
| topic | Cosmology and Nongalactic Astrophysics Instrumentation and Methods for Astrophysics Data Analysis, Statistics and Probability |
| url | https://arxiv.org/abs/2508.10094 |