Dirac Neutrinos and Primordial Magnetic Fields

Abstract

We consider random primordial magnetic fields and discuss their dissipation, coherence length $L_0$, scaling behaviour and constraints implied by the primoridal nucleosynthesis. Such magnetic fields could excite the right-helicity states of Dirac neutrinos, with adverse consequences for nucleosynthesis. We present solutions to the spin kinetic equation of a Dirac neutrino traversing a random magnetic field in the cases of large and small $L_0$, taking also into account elastic collisions. Depending on the scaling behaviour and on the magnetic coherence length, the lower limit on the neutrino magnetic moment thus obtained could be as severe as $10^{-20}{\mu }_B$.

17 pages, HU-TFT-94-26

References in corpus (5)

• On Primordial Magnetic Fields of Electroweak Origin
• Ferromagnetic Vacuum and Galactic Magnetic Fields
• Constraints on the Strength of a Primordial Magnetic Field from Big Bang Nucleosynthesis
• Proton $β% decay in large magnetic fields
• Cosmological Neutrino Mass Limit Revisited

Cited by in corpus (35)

• Magnetic Fields in the Early Universe
• Cosmological Magnetic Fields: Their Generation, Evolution and Observation
• Neutrinos in cosmology
• Primordial Nucleosynthesis: from precision cosmology to fundamental physics
• Large-scale magnetic fields from hydromagnetic turbulence in the very early universe
• Primordial Magnetic Fields
• Progress on Cosmological Magnetic Fields
• The Electrical Conductivity in the Early Universe
• Revisiting Nucleosynthesis Constraints on Primordial Magnetic Fields
• Electromagnetic neutrinos in laboratory experiments and astrophysics
• Neutrino Dispersion in Magnetized Media and Spin Oscillations in the Early Universe
• Electrical conductivity in the early universe
• Magnetic Helicity Generation from the Cosmic Axion Field
• Neutrinos with Magnetic Moment: Depolarization Rate in Plasma
• Implications of a Primordial Magnetic Field for Magnetic Monopoles, Axions, and Dirac Neutrinos
• Constraining Neutrino Lifetimes and Magnetic Moments via Solar Neutrinos in the Large Xenon Detectors
• On the Evolution of Primordial Magnetic Fields
• Relic Right-handed Dirac Neutrinos and Implications for Detection of Cosmic Neutrino Background
• Majorana Neutrino Magnetic Moment and Neutrino Decoupling in Big Bang Nucleosynthesis
• Transport coefficients in the early universe
• The paradox of axions surviving primordial magnetic fields
• Finite dimensional systems with random external fields and Neutrino propagation in fluctuating media
• Bounds on Neutrino Transition Magnetic Moments in Random Magnetic Fields
• Discriminating between Thermal and Nonthermal Cosmic Relic Neutrinos through Annual Modulation at PTOLEMY
• Non-equilibrium quantum plasmas in scalar QED: photon production, magnetic and Debye masses, and conductivity
• Effect of random magnetic field on active-sterile neutrino conversion in the supernova core
• Neutrino conversions in random magnetic fields and ${\tilde{\nu }}_e$ from the Sun
• Neutrino conversions in hot plasma
• Spin-Flavor Oscillations of Relic Neutrinos in Primordial Magnetic Field
• Neutrinos in Cosmology
• Neutrino propagation in a random magnetic field
• Ferromagnetism of Axion Domain Wall
• Magnetic properties of neutrinos in high temperature SU(2)XU(1) gauge theory
• Neutrino Spin-Flavor Conversions and Electron Antineutrino emission from the Sun with Random Magnetic Field
• Behavior of Neutrinos in Stochastic Magnetic Fields