Some aspects of collisional sources for electroweak baryogenesis

Abstract

We consider the dynamics of fermions with a spatially varying mass which couple to bosons through a Yukawa interaction term and perform a consistent weak coupling truncation of the relevant kinetic equations. We then use a gradient expansion and derive the CP-violating source in the collision term for fermions which appears at first order in gradients. The collisional sources together with the semiclassical force constitute the CP-violating sources relevant for baryogenesis at the electroweak scale. We discuss also the absence of sources at first order in gradients in the scalar equation, and the limitations of the relaxation time approximation.

12 pages, 4 figures, talk presented by Tomislav Prokopec at COSMO-01, Rovaniemi, Finland, 09/2001 references added, minor changes in sections 5.3 and 6

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Cited by in corpus (7)

• Transport equations for chiral fermions to order \hbar and electroweak baryogenesis: Part II
• Quantum Transport and Electroweak Baryogenesis
• MSSM Electroweak Baryogenesis and Flavour Mixing in Transport Equations
• Semiclassical force for electroweak baryogenesis: three-dimensional derivation
• Axial Currents from CKM Matrix CP Violation and Electroweak Baryogenesis
• Kinetic approach to electroweak baryogenesis
• An Overview of the Sources for Electroweak Baryogenesis