BibTeX

@article{2508.10094v2,
Author        = {Benedikt Schosser and Caroline Heneka and Björn Malte Schäfer},
Title         = {Starobinsky in Stereo: SKA-CMB Synergy in SBI},
Eprint        = {2508.10094v2},
ArchivePrefix = {arXiv},
PrimaryClass  = {astro-ph.CO},
Abstract      = {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 $\Lambda\mathrm{CDM}$
parameters considerably while improving precision on key astrophysical
quantities.},
Year          = {2025},
Month         = {Aug},
Url           = {http://arxiv.org/abs/2508.10094v2},
File          = {2508.10094v2.pdf}
}