Squeezing information from radio surveys to probe the primordial universe

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dc.contributor.authorKaragiannis, Dionysios
dc.contributor.authorFonseca, José
dc.contributor.authorCamera, Stefano
dc.contributor.authorClarkson, Chris
dc.date.accessioned2025-12-02T10:16:15Z
dc.date.available2025-12-02T10:16:15Z
dc.date.issued2025
dc.description.abstractA major goal of cosmology is to understand the nature of the field(s) which drove primordial Inflation. Through future observations, the statistics of large-scale structure will allow us to probe primordial non-Gaussianity of the curvature perturbation at the end of Inflation. We show how a new correlation statistic can significantly improve these constraints over conventional methods. Next-generation radio telescope arrays are under construction which will map the density field of neutral hydrogen to high redshifts. These telescopes can operate as an interferometer, able to probe small scales, or as a collection of single dishes, combining signals to map the large scales. We show how to fuse these operating modes in order to measure the squeezed bispectrum with higher precision and greater economy. This leads to constraints on primordial non-Gaussianity that will improve on measurements by Planck, and out-perform other surveys such as Euclid. We forecast that σ(f NLloc)∼ 3, achieved by using a small subset, O(102 - 103), of the total number of accessible triangles. The proposed method identifies a low instrumental noise, systematic-free scale regime, enabling clean squeezed bispectrum measurements. This provides a pristine window into local primordial non-Gaussianity, allowing tight constraints not only on primordial non-Gaussianity, but on any observable that peaks in squeezed configurations.
dc.identifier.citationKaragiannis, D., Maartens, R., Saito, S., Fonseca, J., Camera, S. and Clarkson, C., 2025. Squeezing information from radio surveys to probe the primordial universe. Journal of Cosmology and Astroparticle Physics, 2025(08), p.029.
dc.identifier.urihttps://doi.org/10.1088/1475-7516/2025/08/029
dc.identifier.urihttps://hdl.handle.net/10566/21494
dc.language.isoen
dc.publisherInstitute of Physics
dc.subjectinflation
dc.subjectnon-gaussianity
dc.subjectredshift surveys
dc.subjectCosmological inflation
dc.subjectNeutral hydrogen
dc.titleSqueezing information from radio surveys to probe the primordial universe
dc.typeArticle

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