Revisiting the impact of neutrino mass hierarchies on neutrino mass constraints in light of recent DESI data

Abstract

Recent results from DESI combined with cosmic microwave background data give the tightest constraints on the sum of neutrino masses to date. However, these analyses approximate the neutrino mass hierarchy by three degenerate-mass (DM) neutrinos, instead of the normal (NH) and inverted hierarchies (IH) informed by terrestrial neutrino oscillation experiments. Given the stringency of the upper limits from DESI data, we test explicitly whether the inferred neutrino constraints are robust to the choice of neutrino mass ordering using both Bayesian and frequentist methods. For Planck data alone, we find that the DM hierarchy presents a good approximation to the physically motivated hierarchies while showing a strong dependence on the assumed lower bound of the prior, confirming previous studies. For the combined Planck and DESI baryon acoustic oscillation data, we find that assuming NH ($M_{\mathrm{tot}}<0.13\mathrm{eV}$) or IH ($M_{\mathrm{tot}}<0.16\mathrm{eV}$) loosens the Bayesian upper limits compared to the DM approximation ($M_{\mathrm{tot}}<0.086\mathrm{eV}$). The frequentist analysis shows that the different neutrino models fit the data equally well and the loosening of the constraints can thus be attributed to the lower bounds induced by NH and IH. Overall, we find that the DM hierarchy presents a good approximation to the physically motivated hierarchies also for Planck+DESI data as long as the corresponding lower neutrino mass bounds are imposed.

arXiv commentUpdated to match version published in PRD

References in corpus (57)

• A Unified Approach to the Classical Statistical Analysis of Small Signals
• The clustering of galaxies in the completed SDSS-III Baryon Oscillation Spectroscopic Survey: cosmological analysis of the DR12 galaxy sample
• The 6dF Galaxy Survey: Baryon Acoustic Oscillations and the Local Hubble Constant
• Nine-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Final Maps and Results
• The Cosmic Linear Anisotropy Solving System (CLASS) II: Approximation schemes
• Stable clustering, the halo model and nonlinear cosmological power spectra
• In the Realm of the Hubble tension $-$ a Review of Solutions
• The Clustering of the SDSS DR7 Main Galaxy Sample I: A 4 per cent Distance Measure at z=0.15
• Tensions between the Early and the Late Universe
• The fate of hints: updated global analysis of three-flavor neutrino oscillations
• Revising the Halofit Model for the Nonlinear Matter Power Spectrum
• Planck 2018 results. V. CMB power spectra and likelihoods
• DESI 2024 VI: Cosmological Constraints from the Measurements of Baryon Acoustic Oscillations
• Massive neutrinos and cosmology
• Conservative Constraints on Early Cosmology: an illustration of the Monte Python cosmological parameter inference code
• Cobaya: Code for Bayesian Analysis of hierarchical physical models
• 2020 Global reassessment of the neutrino oscillation picture
• Updated fit to three neutrino mixing: exploring the accelerator-reactor complementarity
• Mission design of LiteBIRD
• Unveiling $\nu$ secrets with cosmological data: neutrino masses and mass hierarchy
• The Atacama Cosmology Telescope: DR6 Gravitational Lensing Map and Cosmological Parameters
• The Atacama Cosmology Telescope: A Measurement of the DR6 CMB Lensing Power Spectrum and its Implications for Structure Growth
• Constraints on Cosmology from the Cosmic Microwave Background Power Spectrum of the 2500 ${\mathrm{deg}}^2$ SPT-SZ Survey
• DESI 2024 IV: Baryon Acoustic Oscillations from the Lyman Alpha Forest
• Constraints on the sum of the neutrino masses in dynamical dark energy models with $w(z)\ge -1$ are tighter than those obtained in $\Lambda$CDM
• Neutrino mass from Cosmology
• Cosmic Microwave Weak lensing data as a test for the dark universe
• CMB power spectra and cosmological parameters from Planck PR4 with CamSpec
• Cosmological parameters derived from the final (PR4) Planck data release
• Updated results on neutrino mass and mass hierarchy from cosmology with Planck 2018 likelihoods
• Neutrino masses and the dark energy equation of state - relaxing the cosmological neutrino mass bound
• Neutrino mass in cosmology: status and prospects
• Robust Neutrino Constraints by Combining Low Redshift Observations with the CMB
• Exploring Cosmic Origins with CORE: Cosmological Parameters
• Updated Cosmological Constraints in Extended Parameter Space with Planck PR4, DESI Baryon Acoustic Oscillations, and Supernovae: Dynamical Dark Energy, Neutrino Masses, Lensing Anomaly, and the Hubble Tension
• Probing neutrino masses with future galaxy redshift surveys
• Current cosmological bounds on neutrino masses and relativistic relics
• Neutrino masses and their ordering: Global Data, Priors and Models
• Restoring cosmological concordance with early dark energy and massive neutrinos?
• Cosmological mass limits on neutrinos, axions, and other light particles
• Physical effects involved in the measurements of neutrino masses with future cosmological data
• Neutrino cosmology after DESI: tightest mass upper limits, preference for the normal ordering, and tension with terrestrial observations
• Massive neutrinos and cosmic composition
• Cosmological constraints on the neutrino mass including systematic uncertainties
• Cosmology and the neutrino mass ordering
• Strong Bayesian Evidence for the Normal Neutrino Hierarchy
• Constraining massive neutrinos using cosmological 21 cm observations
• Determining the Neutrino Mass Hierarchy with Cosmology
• Effects of the neutrino mass splitting on the non-linear matter power spectrum
• A novel approach to quantifying the sensitivity of current and future cosmological datasets to the neutrino mass ordering through Bayesian hierarchical modeling
• Objective Bayesian analysis of neutrino masses and hierarchy
• Baryonic feedback biases on fundamental physics from lensed CMB power spectra
• Neutrino Masses and Mass Hierarchy: Evidence for the Normal Hierarchy
• Strong Bounds on Sum of Neutrino Masses in a 12 Parameter Extended Scenario with Non-Phantom Dynamical Dark Energy ($w(z)\ge -1$)
• Quantifying the tension between cosmological and terrestrial constraints on neutrino masses
• Detecting the radiative decay of the cosmic neutrino background with line-intensity mapping
• Profile Likelihoods in Cosmology: When, Why and How illustrated with $\Lambda$CDM, Massive Neutrinos and Dark Energy

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• The CosmoVerse White Paper: Addressing observational tensions in cosmology with systematics and fundamental physics
• Cosmology in Extended Parameter Space with DESI Data Release 2 Baryon Acoustic Oscillations: A 2$\sigma$+ Detection of Nonzero Neutrino Masses with an Update on Dynamical Dark Energy and Lensing Anomaly
• Cosmological constraints on nonphantom dynamical dark energy with DESI Data Release 2 Baryon Acoustic Oscillations: A 3$\sigma$+ lensing anomaly
• Bayesian and frequentist perspectives agree on dynamical dark energy
• Joint 21-cm and CMB Forecasts for Constraining Self-Interacting Massive Neutrinos
• Dark Energy in the DESI Era: A Brief Review of Evidence, Beyond-$\Lambda$CDM Interpretations, and Tensions
• Impostor Among $\nu$s: Dark Radiation Masquerading as Self-Interacting Neutrinos
• Neutrino decays as a natural explanation of the neutrino mass tension
• Widen the Resonance: Probing a New Regime of Neutrino Self-Interactions with Astrophysical Neutrinos
• Cosmological Constraints on Neutrino Masses in a Second-Order CPL Dark Energy Model
• Constraint on Neutrino Statistics from Cosmological Data
• ABCMB: A Python+JAX Package for the Cosmic Microwave Background Power Spectrum