Safi, S. orcid.org/0009-0004-8464-271X, Farhang, M. orcid.org/0000-0002-2199-1902, Mena, O. orcid.org/0000-0001-5225-975X et al. (1 more author) (2024) Semiblind reconstruction of the history of effective number of neutrinos using CMB data. Physical Review D, 110 (10). 103513. ISSN 2470-0010
Abstract
We explore the possibility of redshift-dependent deviations in the contribution of relativistic degrees of freedom to the radiation budget of the cosmos, conventionally parametrized by the effective number of neutrinos Neff, from the predictions of the standard model. We expand the deviations ΔNeff(z) in terms of top-hat functions and treat their amplitudes as the free parameters of the theory to be measured alongside the standard cosmological parameters by the Planck measurements of the cosmic microwave background (CMB) anisotropies and baryonic acoustic oscillations, as well as performing forecasts for futuristic CMB surveys such as PICO and CMB-S4. We reconstruct the history of ΔNeff and find that with the current data the history is consistent with the standard scenario. Inclusion of the new degrees of freedom in the analysis increases H0 to 68.71±0.44, slightly reducing the Hubble tension. With the smaller forecasted errors on the ΔNeff(z) parametrization modes from future CMB surveys, very accurate bounds are expected within the possible range of dark radiation models.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2024 The Authors. Except as otherwise noted, this author-accepted version of a journal article published in Physical Review D is made available via the University of Sheffield Research Publications and Copyright Policy under the terms of the Creative Commons Attribution 4.0 International License (CC-BY 4.0), which permits unrestricted use, distribution and reproduction in any medium, provided the original work is properly cited. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ |
Keywords: | Cosmic microwave background; Cosmological parameters; Astrophysical & cosmological simulations; Telescopes |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Science (Sheffield) > School of Mathematical and Physical Sciences |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 17 Dec 2024 10:44 |
Last Modified: | 19 Mar 2025 13:44 |
Status: | Published |
Publisher: | American Physical Society (APS) |
Refereed: | Yes |
Identification Number: | 10.1103/physrevd.110.103513 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:220924 |