Probing the neutrino chemical potential with cosmological observations

arXiv:2606.28135 · hep-ph, astro-ph.CO · Submitted 2026-06-26 · Read on arXiv

Pietro Ghedini, Riccardo Impavido, Stefano Gariazzo, Olga Mena, Deng Wang

hep-ph, astro-ph.CO

Submitted: 2026-06-26

Comments: 16 pages, 7 figures, 4 tables. Comments are welcome

Code: https://github.com/williamgiare/wgcosmo

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Terminology

• Abundance — 10× in this paper · explained in 1 episode
• Degeneracy — 9× in this paper · explained in 3 episodes
• Matter Power Spectrum — 6× in this paper · explained in 2 episodes
• Piecewise Cubic Hermite Interpolating Polynomial — 3× in this paper
• Anisotropy — 2× in this paper · explained in 3 episodes
• Big Bang Nucleosynthesis — 2× in this paper
• Baryon Acoustic Oscillations — 1× in this paper
• Consistency — 1× in this paper · explained in 3 episodes
• Cooperation — 1× in this paper · explained in 2 episodes
• Dark Energy Spectroscopic Instrument — 1× in this paper
• Decoupling — 1× in this paper · explained in 2 episodes

Sources

• Planck 2018 results. VI. Cosmological parameters
• Primordial Nucleosynthesis: from precision cosmology to fundamental physics
• Cosmological bounds on neutrino statistics
• Primordial neutrinos fade to gray: constraints from cosmological observables
• Constraint on Neutrino Statistics from Cosmological Data
• What can CMB observations tell us about the neutrino distribution function?
• Improved constraints on lepton asymmetry from the cosmic microwave background
• Flavor versus mass eigenstates in neutrino asymmetries: implications for cosmology
• Probing the properties of relic neutrinos using the cosmic microwave background, the Hubble Space Telescope and galaxy clusters
• Forecast on lepton asymmetry from future CMB experiments
• Lepton Flavor Asymmetries: from the early Universe to BBN
• A Limit on the Total Lepton Number in the Universe from BBN and the CMB
• Primordial lepton asymmetries: neutrino transport, spectral distortions and cosmological constraints
• Neutrinophilic $\mathbf{\Lambda}$CDM Extension for EMPRESS, DESI and Hubble Tension
• Hubble tension in lepton asymmetric cosmology with an extra radiation
• The LBT Y$_\mathrm{p}$ Project IV: A New Value of the Primordial Helium Abundance
• EMPRESS. VIII. A New Determination of Primordial He Abundance with Extremely Metal-Poor Galaxies: A Suggestion of the Lepton Asymmetry and Implications for the Hubble Tension
• Primordial lepton asymmetries in the precision cosmology era: Current status and future sensitivities from BBN and the CMB
• Neutrinos And Big Bang Nucleosynthesis
• Precision big bang nucleosynthesis with improved Helium-4 predictions

Related papers

• Classification of g-modes for neutron stars with a strong transition: Novel universal relation including slow stable hybrid stars
• Higgsino Dark Matter Interpretation of the LUX-ZEPLIN 248 keV Nuclear-Recoil Event
• A Unified Bogoliubov Approach to Primordial Gravitational Waves: From Inflation to Reheating
• Probing Memory-Burdened Primordial Black Holes with High-Energy Neutrinos
• Enhanced Dark Matter Quantum Sensing via Phase-Space Geometric Interferometry
• Axions as Dark Matter, Dark Energy, and Dark Radiation