Relic neutrino decoupling including flavour oscillations

Abstract

In the early universe, neutrinos are slightly coupled when electron-positron pairs annihilate transferring their entropy to photons. This process originates non-thermal distortions on the neutrino spectra which depend on neutrino flavour, larger for nu_e than for nu_mu or nu_tau. We study the effect of three-neutrino flavour oscillations on the process of neutrino decoupling by solving the momentum-dependent kinetic equations for the neutrino spectra. We find that oscillations do not essentially modify the total change in the neutrino energy density, giving N_eff=3.046 in terms of the effective number of neutrinos, while the small effect over the production of primordial 4He is increased by O(20%), up to 2.1 x 10^{-4}. These results are stable within the presently favoured region of neutrino mixing parameters.

18 pages, 2 figures

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• Constraining Holographic Dark Energy and Analyzing Cosmological Tensions
• Cosmological limits on axions and axion-like particles
• Effects of an Intermediate Mass Sterile Neutrino Population on the Early Universe
• S.M.A.S.H.E.D.: Standard Model Axion Seesaw Higgs Inflation Extended for Dirac Neutrinos
• Daughters mimic sterile neutrinos (almost!) perfectly
• QED corrections to the big-bang nucleosynthesis reaction rates
• Cosmological data and indications for new physics
• Entanglement in anisotropic expanding spacetime
• Traveling Through the Universe: Back in Time to the Quark-Gluon Plasma Era
• Boltzmann Equation Solver Adapted to Emergent Chemical Non-equilibrium
• More General BBN Constraints on Neutrino Oscillations Parameters - Relaxed or Strengthened
• Roles of sterile neutrinos in particle physics and cosmology
• Freeze-In of radiative keV-scale neutrino dark matter from a new $\text{U}(1{)}_{\text{B-L}}$
• Scalar Dark Matter and Radiative Dirac neutrino mass in an extended $U(1{)}_{B-L}$ model
• Special cosmological models derived from the semiclassical Einstein equation on flat FLRW space-times
• Signals of a New Gauge Boson from IceCube and Muon $g-2$
• Self-interacting neutrinos, the Hubble parameter tension, and the Cosmic Microwave Background
• The C$\nu$B energy density through the quantum measurement theory
• Probing dark photons in the early universe with big bang nucleosynthesis
• Explanation of the 511 keV line: Cascade annihilating dark matter with the ${}^8$Be anomaly
• BBN constraints on dark radiation isocurvature
• Massive Fermi Gas in the Expanding Universe
• Dark energy with the help of interacting dark sectors
• Oscillations of sterile neutrinos from dark matter decay eliminates the IceCube-Fermi tension
• Weak Interaction Rate Coulomb Corrections in Big Bang Nucleosynthesis
• Majorana dark matter through the Higgs portal under the vacuum stability lamppost
• Dark Matter Candidates in a Visible Heavy QCD Axion Model
• Measuring inflaton couplings via dark radiation as $\Delta N_{\mathrm{eff}}$ in CMB
• Challenges in Cosmology from the Big Bang to Dark Energy, Dark Matter and Galaxy Formation
• Binomial Line Cox Processes: Statistical Characterization and Applications in Wireless Network Analysis
• Extra relativistic degrees of freedom without extra particles using Planck data
• Planck constraints on neutrino isocurvature density perturbations
• The influence of the effective number of active and sterile neutrinos on the determination of the values of cosmological parameters
• Diffuse Boosted Cosmic Neutrino Background
• Relic neutrinos: Antineutrinos of Primordial Nucleosynthesis
• Trading kinetic energy: How late kinetic decoupling of dark matter changes $N_{\text{eff}}$
• Constraints on the $\Lambda$CDM model with redshift tomography
• Prospects and Limitations for Constraining Light Relics with Primordial Abundance Measurements
• Cosmology at high redshift -- a probe of fundamental physics
• Reconciling BICEP2 and Planck results with right-handed Dirac neutrinos in the fundamental representation of grand unified E_6
• Primordial power spectrum versus extension parameters beyond the standard model
• Fermi-Boltzmann statistics of neutrinos and relativistic effective degrees of freedom
• Baryogenesis and Dark Matter in Multiple Hidden Sectors
• Scalar and Fermion field interactions with a gravitational wave
• Cosmic Microwave Background Anisotropy numerical solution (CMBAns) I: An introduction to $C_l$ calculation
• Impact of the cosmic neutrino background on black hole superradiance
• Non-thermal Axion Dark Radiation and Constraints
• Linking the $R_{K^{(\ast )}}$ anomalies to the Hubble tension via a single right-handed neutrino
• Fugacity and Reheating of Primordial Neutrinos
• One Extension to Explain Them All, One Scale-Invariant Spectrum to Test Them All, and in One Model Bind Them
• Reviewing the prospect of fermion triplets as dark matter and source of baryon asymmetry in non-standard cosmology
• Constraints on $N_{\mathrm{eff}}$ of high energy non-thermal neutrino injections upto $z\sim 10^8$ from CMB spectral distortions and abundance of light elements
• Quantum algorithm for the Vlasov simulation of the large-scale structure formation with massive neutrinos
• Hubble Hullabaloo and String Cosmology
• Warm Hawking Relics From Primordial Black Hole Domination
• Fast and Flexible Neutrino Decoupling Part I: The Standard Model
• Dark sector production and baryogenesis from not quite black holes
• Imprints of MeV Scale Hidden Dark Sector at Planck Data
• Endowing $\mathbf{\Lambda }$ with a dynamic nature: constraints in a spatially curved Universe
• Generation of neutrino dark matter, baryon asymmetry, and radiation after quintessential inflation
• Dark Photon as Fractional Cosmic Neutrino Masquerader
• Big Bang Nucleosynthesis and Neutrino Cosmology
• Cosmic Neutrino Decoupling and its Observable Imprints: Insights from Entropic-Dual Transport
• Cosmological consequences of a scalar field with oscillating equation of state. IV. Primordial nucleosynthesis and the deuterium problem
• Constraining Neutrinos and Dark Energy with Galaxy Clustering in the Dark Energy Survey
• Primordial Nucleosynthesis: an updated comparison of observational light nuclei abundances with theoretical predictions
• Proposal for Resonant Detection of Relic Massive Neutrinos
• Comparison of results on $N_{\mathrm{eff}}$ from various Planck likelihoods
• Big Bang nucleosynthesis in a weakly non-ideal plasma
• Effect of neutrino rest mass on ionization equilibrium freeze-out
• Axino Dark Matter in Moduli-induced Baryogenesis
• Sub-eV upper limits on neutrino masses from cosmology
• Gravitational Lensing of the Cosmic Neutrino Background
• Scale and redshift dependent limits on cosmic neutrino properties
• Asymmetric dark matter and effective number of neutrinos
• Effects of quantum statistics on relic density of Dark Radiation
• Measuring neutrino mass imprinted on the anisotropic galaxy clustering
• Updated reduced CMB data and constraints on cosmological parameters
• High-Precision Measurement of D($\gamma$, $n$)$p$ Photodisintegration Reaction and Implications for Big-Bang Nucleosynthesis
• A flexible parameterization to test early physics solutions to the Hubble tension with future CMB data
• Self-interacting Dark Matter with Scalar Dilepton Mediator
• Cosmology with Independently Varying Neutrino Temperature and Number
• Primordial neutrinos fade to gray: constraints from cosmological observables
• Data Analysis and Phenomenological Cosmology
• Dark Radiation in Spectator Axion-Gauge Models
• The Hierarchy Problem: From the Fundamentals to the Frontiers
• Precision calculation of neutrino evolution in the early Universe
• Relic neutrino clustering in the Milky Way
• Probing Dark Sector Particles Coupling to Neutrinos with Double Beta Decay
• $\Delta N_{\text{eff}}$ and entropy production from early-decaying gravitinos
• Neutrinos in Astrophysics and Cosmology: Theoretical Advanced Study Institute (TASI) 2020 Lectures
• Upper limits on neutrino masses from cosmology
• Reducing the Tension Between the BICEP2 and the Planck Measurements: A Complete Exploration of the Parameter Space
• Precision calculation of $N_{\text{eff}}$ with Neutrino Direct Simulation Monte Carlo
• Constraints on cosmological parameters and CMB first acoustic peak in conformal Killing gravity
• Improving CMB constraints on early Universe physics with LSS: A multi-probe forecast including cross-covariance
• Testing the coupling of dark radiations in light of the Hubble tension
• Dark matter in the KL moduli stabilization scenario with SUSY breaking sector from $\mathcal{N}=1$ SQCD
• Big Bang Nucleosynthesis constraints on space-time noncommutativity
• Alleviating the Hubble tension with Torsion Condensation (TorC)
• Genesis of baryon and dark matter asymmetries through ultraviolet scattering freeze-in
• Propagation of Electromagnetic Waves in Extremely Dense Media
• The Universe at the MeV era: neutrino evolution and cosmological observables
• Robustness of cosmological axion mass limits
• Big-Bang Nucleosynthesis on a bubble universe nucleated in Kerr-AdS${}_5$ Black Hole
• Is PLANCK consistent with primordial deuterium measurements ?
• Relativistic effective degrees of freedom and quantum statistics of neutrinos
• Superheavy Dark Matter in Light of Dark Radiation
• Phenomenology of Dirac neutrino EFTs up to dimension six
• Towards a precision calculation of $N_{\mathrm{eff}}$ in the Standard Model IV: Estimating the impact of positronium formation
• Improving cosmological constraints via galaxy intrinsic alignment in full-shape analysis
• Dissecting the $H_0$ and $S_8$ tensions with Planck + BAO + supernova type Ia in multi-parameter cosmologies
• Standard and non-standard primordial neutrinos
• Big Bang Nucleosynthesis as a probe of non-standard neutrino interactions and non-unitary three-neutrino mixing
• SageNet: Fast Neural Network Emulation of the Stiff-amplified Gravitational Waves from Inflation
• Lepton Number and Expansion of the Universe
• Scalar field dark matter with two components: combined approach from particle physics and cosmology
• From $U(1)\times U(1)$ Symmetry Breaking to Majoron Cosmology: Insights from NANOGrav 15-year Data
• Particle physics and cosmology intertwined
• Fluids in cosmology
• On the baryon acoustic oscillation amplitude as a probe of radiation density
• Fifty shades of grayness: parametrizations of spectral distortions and applications in cosmology
• The effect of primordial fluctuations on neutrino oscillations
• Quarks to Cosmos: Particles and Plasma in Cosmological evolution
• The impact of the locally measured Hubble parameter on the mass of Sterile neutrino
• Dark Radiation and Inflationary Freedom
• Big Bang nucleosynthesis and baryogenesis in power-law $f(R)$ gravity: Revised constraints from the semianalytical approach
• Sound Speed and Viscosity of Semi-Relativistic Relic Neutrinos
• Kination cosmology from scalar fields and gravitational-wave signatures
• Dark Radiation and Inflationary Freedom
• Constraining Tsallis Corrections to Photon Reheating from Electron-Positron Annihilation: A Phenomenological Approach
• Non Thermal Features in the Cosmic Neutrino Background
• Primordial helium-3 redux: The helium isotope ratio of the Orion nebula
• ABCMB: A Python+JAX Package for the Cosmic Microwave Background Power Spectrum
• Studying Both the Universe and Neutrinos Themselves Using Cosmic and Astrophysical Neutrinos
• Cosmic Neutrinos and Other Light Relics
• Cosmological perturbation theory with trinity of scalar fields
• Cosmological Probes of Lepton Parity Freeze-in Dark Matter: $\Delta N_{\mathrm{eff}}$ & Gravitational Waves
• Constraining effective neutrino species with bispectrum of large scale structures
• Cosmological constraints on sterile neutrino Dark Matter production mechanisms
• Doubly Logarithmic Corrections to Radiation Domination from CET Ω: Theory and Planck/BBN Constraints
• Large Neutrino-Dark Matter Interactions: From Effective Field Theory to Ultraviolet Completions