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Non-Gaussianity in rapid-turn multi-field inflation
Nordita SU.ORCID iD: 0000-0002-6222-1664
The Oskar Klein Centre for Cosmoparticle Physics, Department of Physics, Stockholm University, AlbaNova, Stockholm 10691, Sweden, AlbaNova.
Nordita SU.
2024 (English)In: Journal of Cosmology and Astroparticle Physics, E-ISSN 1475-7516, Vol. 2024, no 3, article id 014Article in journal (Refereed) Published
Abstract [en]

We show that theories of inflation with multiple, rapidly turning fields can generate large amounts of non-Gaussianity. We consider a general theory with two fields, an arbitrary field-space metric, and a potential that supports sustained, rapidly turning field trajectories. Our analysis accounts for non-zero field cross-correlation and does not fix the power spectra of curvature and isocurvature perturbations to be equal at horizon crossing. Using the δN formalism, we derive a novel, analytical formula for bispectrum generated from multi-field mixing on super-horizon scales. Rapid-turn inflation can produce a bispectrum with several potentially large contributions that are not necessarily of the local shape. We exemplify the applicability of our formula with a fully explicit model and show that the new contributions indeed can generate a large amplitude of local non-Gaussianity, f NLloc ∼ O(1). These results will be important when interpreting the outcomes of future observations.

Place, publisher, year, edition, pages
IOP Publishing , 2024. Vol. 2024, no 3, article id 014
Keywords [en]
inflation, Inflation and CMBR theory, non-gaussianity, physics of the early universe
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:kth:diva-344587DOI: 10.1088/1475-7516/2024/03/014ISI: 001182138000002Scopus ID: 2-s2.0-85187339124OAI: oai:DiVA.org:kth-344587DiVA, id: diva2:1845975
Note

QC 20240322

Available from: 2024-03-20 Created: 2024-03-20 Last updated: 2024-04-26Bibliographically approved

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  • apa
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  • de-DE
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  • en-US
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  • nn-NO
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