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LiteBIRD science goals and forecasts. A case study of the origin of primordial gravitational waves using large-scale CMB polarization
Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Nordic Institute for Theoretical Physics (Nordita).ORCID iD: 0000-0003-1760-0355
Number of Authors: 1102024 (English)In: Journal of Cosmology and Astroparticle Physics, E-ISSN 1475-7516, Vol. 2024, no 6, article id 008Article in journal (Refereed) Published
Abstract [en]

We study the possibility of using the LiteBIRD satellite B-mode survey to constrain models of inflation producing specific features in CMB angular power spectra. We explore a particular model example, i.e. spectator axion-SU(2) gauge field inflation. This model can source parity-violating gravitational waves from the amplification of gauge field fluctuations driven by a pseudoscalar "axionlike"field, rolling for a few e-folds during inflation. The sourced gravitational waves can exceed the vacuum contribution at reionization bump scales by about an order of magnitude and can be comparable to the vacuum contribution at recombination bump scales. We argue that a satellite mission with full sky coverage and access to the reionization bump scales is necessary to understand the origin of the primordial gravitational wave signal and distinguish among two production mechanisms: quantum vacuum fluctuations of spacetime and matter sources during inflation. We present the expected constraints on model parameters from LiteBIRD satellite simulations, which complement and expand previous studies in the literature. We find that LiteBIRD will be able to exclude with high significance standard single-field slow-roll models, such as the Starobinsky model, if the true model is the axion-SU(2) model with a feature at CMB scales. We further investigate the possibility of using the parity-violating signature of the model, such as the TB and EB angular power spectra, to disentangle it from the standard single-field slow-roll scenario. We find that most of the discriminating power of LiteBIRD will reside in BB angular power spectra rather than in TB and EB correlations.

Place, publisher, year, edition, pages
2024. Vol. 2024, no 6, article id 008
Keywords [en]
CMBR experiments, gravitational waves and CMBR polarization, inflation, primordial gravitational waves (theory)
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:su:diva-235638DOI: 10.1088/1475-7516/2024/06/008Scopus ID: 2-s2.0-85196038092OAI: oai:DiVA.org:su-235638DiVA, id: diva2:1914027
Available from: 2024-11-18 Created: 2024-11-18 Last updated: 2024-11-18Bibliographically approved

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Gudmundsson, Jón E.

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The Oskar Klein Centre for Cosmo Particle Physics (OKC)Department of PhysicsNordic Institute for Theoretical Physics (Nordita)
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