Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 3, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1475-7516/2017/03/050
Keywords
non-gaussianity; cosmological parameters from LSS; inflation; particle physics-cosmology connection
Funding
- Perimeter Institute for Theoretical Physics
- Government of Canada through Department of Innovation, Science and Economic Development Canada
- Province of Ontario through Ministry of Research, Innovation and Science
- Simons Foundation
- National Science Foundation [PHY-1066293]
- Direct For Mathematical & Physical Scien
- Division Of Physics [1650217] Funding Source: National Science Foundation
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It is generally expected that heavy fields are present during inflation, which can leave their imprint in late-time cosmological observables. The main signature of these fields is a small amount of distinctly shaped non-Gaussianity, which if detected, would provide a wealth of information about the particle spectrum of the inflationary Universe. Here we investigate to what extent these signatures can be detected or constrained using futuristic 21-cm surveys. We construct model-independent templates that extract the squeezed-limit behavior of the bispectrum, and examine their overlap with standard inflationary shapes and secondary non-Gaussianities. We then use these templates to forecast detection thresholds for different masses and couplings using a 3D reconstruction of modes during the dark ages (z similar to 30-100). We consider interactions of several broad classes of models and quantify their detectability as a function of the baseline of a dark ages interferometer. Our analysis shows that there exists the tantalizing possibility of discovering new particles with different masses and interactions with future 21-cm surveys.
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