Systematic approach to thermal leptogenesis
| Autor: | Tibor Frossard, David Mitrouskas, Alexander Kartavtsev, Mathias Garny, Andreas Hohenegger |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
Physics
Nuclear and High Energy Physics Thermal quantum field theory 010308 nuclear & particles physics Yukawa potential FOS: Physical sciences 01 natural sciences Scattering amplitude High Energy Physics - Phenomenology High Energy Physics - Phenomenology (hep-ph) Leptogenesis Quantum electrodynamics 0103 physical sciences Quasiparticle Higgs boson ddc:530 High Energy Physics::Experiment Quantum field theory 010306 general physics Effective action |
| Zdroj: | Physical Review D Phys.Rev. PHYSICAL REVIEW D Physical review / D 87(8), 085009 (2013). doi:10.1103/PhysRevD.87.085009 Red Report (2012). |
| ISSN: | 1550-2368 1550-7998 |
| Popis: | In this work we study thermal leptogenesis using non-equilibrium quantum field theory. Starting from fundamental equations for correlators of the quantum fields we describe the steps necessary to obtain quantum kinetic equations for quasiparticles. These can easily be compared to conventional results and overcome conceptional problems inherent in the canonical approach. Beyond CP-violating decays we include also those scattering processes which are tightly related to the decays in a consistent approximation of fourth order in the Yukawa couplings. It is demonstrated explicitly how the S-matrix elements for the scattering processes in the conventional approach are related to two- and three-loop contributions to the effective action. We derive effective decay and scattering amplitudes taking medium corrections and thermal masses into account. In this context we also investigate CP-violating Higgs decay within the same formalism. From the kinetic equations we derive rate equations for the lepton asymmetry improved in that they include quantum-statistical effects and medium corrections to the quasiparticle properties. 38 pages, 23 figures |
| Databáze: | OpenAIRE |
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