Systematic approach to leptogenesis in nonequilibrium QFT: self-energy contribution to the CP-violating parameter

Abstract

In the baryogenesis via leptogenesis scenario the self-energy contribution to the CP-violating parameter plays a very important role. Here, we calculate it in a simple toy model of leptogenesis using the Schwinger-Keldysh/Kadanoff-Baym formalism as starting point. We show that the formalism is free of the double-counting problem typical for the canonical Boltzmann approach. Within the toy model, medium effects increase the CP-violating parameter. In contrast to results obtained earlier in the framework of thermal field theory, the medium corrections are linear in the particle number densities. In the resonant regime quantum corrections lead to modified expressions for the CP-violating parameter and for the decay width. Most notably, in the maximal resonant regime the Boltzmann picture breaks down and an analysis in the full Kadanoff-Baym formalism is required.

28 pages, 14 figures

References in corpus (10)

• The nuMSM, leptonic asymmetries, and properties of singlet fermions
• Quantum Boltzmann Equations and Leptogenesis
• Systematic approach to leptogenesis in nonequilibrium QFT: vertex contribution to the CP-violating parameter
• On Resonant Leptogenesis
• Is leptogenesis falsifiable at LHC?
• Quantum field thermalization in expanding backgrounds
• Comparison of Boltzmann Kinetics with Quantum Dynamics for a Chiral Yukawa Model Far From Equilibrium
• Supersymmetric Leptogenesis and the Gravitino Bound
• All orders Boltzmann collision term from the multiple scattering expansion of the self-energy
• Solving the Homogeneous Boltzmann Equation with Arbitrary Scattering Kernel

Cited by in corpus (58)

• Matter and Antimatter in the Universe
• The Phenomenology of Right Handed Neutrinos
• Dark Matter, Baryogenesis and Neutrino Oscillations from Right Handed Neutrinos
• Sterile Neutrinos as the Origin of Dark and Baryonic Matter
• Neutrino Quantum Kinetics
• The Present and Future Status of Heavy Neutral Leptons
• Flavour Covariant Transport Equations: an Application to Resonant Leptogenesis
• Baryogenesis from the weak scale to the grand unification scale
• Quantum Leptogenesis I
• Flavoured Leptogenesis in the CTP Formalism
• Leptogenesis in the Universe
• Leptogenesis from first principles in the resonant regime
• Lepton Flavour Violation and theta(13) in Minimal Resonant Leptogenesis
• Effective Theory of Resonant Leptogenesis in the Closed-Time-Path Approach
• Kadanoff-Baym Approach to Flavour Mixing and Oscillations in Resonant Leptogenesis
• Flavor effects in leptogenesis
• Resonant enhancement in leptogenesis
• The minimal scenario of leptogenesis
• Probing leptogenesis with GeV-scale sterile neutrinos at LHCb and BELLE II
• Scattering Rates For Leptogenesis: Damping of Lepton Flavour Coherence and Production of Singlet Neutrinos
• Uniting low-scale leptogeneses
• Mass bounds for baryogenesis from particle decays and the inert doublet model
• Systematic approach to thermal leptogenesis
• Leptogenesis: The Other Cuts
• Decay of a Yukawa fermion at finite temperature and applications to leptogenesis
• The Boltzmann Equation from Quantum Field Theory
• Perturbative Non-Equilibrium Thermal Field Theory
• Strong Washout Approximation to Resonant Leptogenesis
• Leptogenesis with small violation of B-L
• Finite Width in out-of-Equilibrium Propagators and Kinetic Theory
• Baryon Asymmetry of the Universe without Boltzmann or Kadanoff-Baym
• Leptogenesis from Soft Supersymmetry Breaking (Soft Leptogenesis)
• Hard-Thermal-Loop Corrections in Leptogenesis II: Solving the Boltzmann Equations
• Relativistic and spectator effects in leptogenesis with heavy sterile neutrinos
• Cuts, Cancellations and the Closed Time Path: The Soft Leptogenesis Example
• Baryogenesis from Mixing of Lepton Doublets
• Perturbative Non-Equilibrium Thermal Field Theory to all Orders in Gradient Expansion
• Leptogenesis from Additional Higgs Doublets
• Non-Minimal Chaotic Inflation, Peccei-Quinn Phase Transition and non-Thermal Leptogenesis
• Flavour mixing transport theory and resonant leptogenesis
• Tachyonic production of dark relics: a non-perturbative quantum study
• Cutting rules on a cylinder: a bottom-up approach to quantum kinetic theory for the early universe
• Dissipation of oscillating scalar backgrounds in an FLRW universe
• Freeze-in Dirac neutrinogenesis: thermal leptonic CP asymmetry
• Nonthermal $CP$ violation in soft leptogenesis
• Systematic approach to Delta L=1 processes in thermal leptogenesis
• Flavour effects in Resonant Leptogenesis from semi-classical and Kadanoff-Baym approaches
• Leptogenesis: Theory and Neutrino Masses
• Fate of homogeneous ${\mathbb{Z}}_2$-symmetric scalar condensates
• Phenomenology of Baryogenesis from Lepton-Doublet Mixing
• Basis invariant measure of CP-violation and renormalization
• Backreaction Effects on Nonequilibrium Spectral Function
• Reconciling resonant leptogenesis and baryogenesis via neutrino oscillations
• Relating quantum mechanics and kinetics of neutrino oscillations
• Forbidden neutrinogenesis
• Scattering versus Forbidden Decay in Dark Matter Freeze-in
• Cutting rules on a cylinder and simplified diagrammatic approach to $CP$ violation in quantum kinetic theory
• Elementary excitations of a Higgs-Yukawa system