Decay of heavy Majorana neutrinos using the full Boltzmann equation including its implications for leptogenesis

Abstract

We have studied the two-body production and decay of a heavy, right-handed neutrino to two light states using the full Boltzmann equation instead of the usual integrated Boltzmann equation which assumes kinetic equilibrium of all species. Decays and inverse decays are inefficient for thermalising the distribution function of the heavy neutrino and in some parameter ranges there can be very large deviations from kinetic equilibrium. This leads to substantial numerical differences between the two approaches. Furthermore we study the impact of this difference on the lepton asymmetry production during leptogenesis and find that in the strong washout regime the final asymmetry is changed by 15-30% when the full Boltzmann equation is used.

11 pages, 6 figures, minor changes

References in corpus (6)

• The importance of flavor in leptogenesis
• Flavour Issues in Leptogenesis
• Flavor effects on leptogenesis predictions
• Leptogenesis beyond the limit of hierarchical heavy neutrino masses
• Breaking of L_mu - L_tau Flavor Symmetry, Lepton Flavor Violation and Leptogenesis
• Thermal leptogenesis in extended supersymmetric seesaw

Cited by in corpus (35)

• Leptogenesis
• Leptogenesis in the Universe
• Finite Number Density Corrections to Leptogenesis
• Systematic approach to leptogenesis in nonequilibrium QFT: vertex contribution to the CP-violating parameter
• Comment on "Is Dark Matter with Long-Range Interactions a Solution to All Small-Scale Problems of ΛCDM Cosmology?"
• Towards leptogenesis at NLO: the right-handed neutrino interaction rate
• Full Boltzmann equations for leptogenesis including scattering
• Leptogenesis in the two right-handed neutrino model revisited
• Flavor symmetries, leptogenesis and the absolute neutrino mass scale
• Mass bounds for baryogenesis from particle decays and the inert doublet model
• Constraints on secret neutrino interactions after Planck
• Systematic approach to thermal leptogenesis
• Decay of a Yukawa fermion at finite temperature and applications to leptogenesis
• Particle-antiparticle asymmetries from annihilations
• On baryogenesis from dark matter annihilation
• The role of CP violating scatterings in baryogenesis - case study of the neutron portal
• Thermal Goldstino Production with Low Reheating Temperatures
• Non-relativistic leptogenesis
• Relativistic and spectator effects in leptogenesis with heavy sterile neutrinos
• On the full Boltzmann equations for Leptogenesis
• Baryogenesis from Mixing of Lepton Doublets
• Leptogenesis from Additional Higgs Doublets
• Predictive Leptogenesis from Minimal Lepton Flavour Violation
• Flavour mixing transport theory and resonant leptogenesis
• Cutting rules on a cylinder: a bottom-up approach to quantum kinetic theory for the early universe
• Examining leptogenesis with lepton flavor violation and the dark matter abundance
• Solving the Homogeneous Boltzmann Equation with Arbitrary Scattering Kernel
• Decaying neutrinos: The long way to isotropy
• Phenomenology of Baryogenesis from Lepton-Doublet Mixing
• A New Era of Leptogenesis
• Wash-Out in N_2-dominated leptogenesis
• The Neutrino Mass Bound from Leptogenesis Revisited
• Leptogenesis assisted by scalar decays
• Quasiparticles in Leptogenesis - A hard-thermal-loop study
• Developments in Leptogenesis