Forconi, M. orcid.org/0000-0003-4754-3689, Di Valentino, E. orcid.org/0000-0001-8408-6961, Melchiorri, A. et al. (1 more author) (2024) Possible impact of non-Gaussianities on cosmological constraints in neutrino physics. Physical Review D, 109 (12). 123532. ISSN 2470-0010
Abstract
The search for non-Gaussian signatures in the cosmic microwave background (CMB) is crucial for understanding the physics of the early Universe. Given the possibility of non-Gaussian fluctuations in the CMB, a recent revision to the standard Λ-cold dark matter (ΛCDM) model has been proposed, dubbed "super-ΛCDM."This model introduces additional free parameters to account for the potential effects of a trispectrum in the primordial fluctuations. In this study, we explore the impact of the super-ΛCDM model on current constraints in neutrino physics. In agreement with previous research, our analysis reveals that, for most of the datasets, the super-ΛCDM parameter A0 significantly deviates from zero at over a 95% confidence level. We then demonstrate that this signal might influence current constraints in the neutrino sector. Specifically, we find that the current constraints on neutrino masses may be relaxed by over a factor of 2 within the super-ΛCDM framework, thanks to the correlation present with A0; such relaxation persists even when we apply constraints to the trispectrum from local measurements, assuming a strong similarity between the two forms. Consequently, locking A0=0 might introduce a bias, leading to overly stringent constraints on the total neutrino mass.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2024 American Physical Society. Reproduced in accordance with the publisher's self-archiving policy. |
Keywords: | Nuclear and Plasma Physics; Particle and High Energy Physics; Physical Sciences |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Science (Sheffield) > School of Mathematics and Statistics (Sheffield) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 31 Jul 2024 15:47 |
Last Modified: | 31 Jul 2024 15:47 |
Status: | Published |
Publisher: | American Physical Society (APS) |
Refereed: | Yes |
Identification Number: | 10.1103/physrevd.109.123532 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:215566 |