{"arxiv_id":"hep-ph/0703175","title":"Quantum Boltzmann Equations and Leptogenesis","abstract":"The closed time-path formalism is a powerful Green's function formulation to describe non-equilibrium phenomena in field theory and it leads to a complete non-equilibrium quantum kinetic theory. We make use of this formalism to write down the set of quantum Boltzmann equations relevant for leptogenesis. They manifest memory effects and off-shell corrections. In particular, memory effects lead to a time-dependent CP asymmetry whose value at a given instant of time depends upon the previous history of the system. This result is particularly relevant when the asymmetry is generated by the decays of nearly mass-degenerate heavy states, as in resonant or soft leptogenesis.","primary_cat":"hep-ph","cross_cats":[],"submitted_at":"2007-03-16T14:41:08+00:00","latest_version":2,"source":"arxiv","source_label":"arXiv","source_url":null,"has_pdf":true,"has_source":false,"verdict":"CONDITIONAL","confidence":"HIGH","one_line_summary":"Using the closed time-path formalism, the authors derive non-Markovian quantum Boltzmann equations for leptogenesis and show the CP asymmetry is time-dependent, oscillating on a timescale set by the heavy-neutrino mass splitting.","novelty_score":5.0,"correctness_risk":"medium","formal_verification":"none","upvotes":0,"downvotes":0,"pith_score":0,"inbound_count":29,"_links":{"html":"https://pith.science/paper/hep-ph/0703175","verdict":"/api/v1/verdicts/hep-ph/0703175"}}