Conveners
Parallel Session: Cosmology & Astroparticle Physics - Baryogenesis
- Marco Drewes
- Valerie Domcke
Mr
Juraj Klarić
(Technical University Munich)
27/09/2017, 16:05
Cosmology & Astroparticle Physics
Heavy neutrinos with masses below the electroweak scale can simultaneously generate the light neutrino masses via the seesaw mechanism and the baryon asymmetry of the universe via leptogenesis. The requirement to explain these phenomena imposes constraints on the mass spectrum of the heavy neutrinos, their flavour mixing pattern and their CP properties. We first combine bounds from different...
Dr
Ye-Ling Zhou
(IPPP Durham)
27/09/2017, 16:22
Cosmology & Astroparticle Physics
The simplest description of Majorana neutrino masses is the dimension-5 lepton-number-violating Weinberg operator. It automatically provides out-of-equilibrium dynamics in the early Universe due to the suppression of neutrino masses. Three Sakharov conditions are satisfied if there is a CP-violating phase transition. The latter is strongly motivated by the breaking of some underlying...
Ms
Jorinde van de Vis
(Nikhef)
27/09/2017, 16:39
Cosmology & Astroparticle Physics
Effective field theory is an attractive framework to study Electroweak Baryogenesis in a model-independent way. We add a dimension-six operator to the Higgs potential in order to have a strongly first order phase transition, which is necessary for successful baryogenesis. Another necessary ingredient is CP-violation, which can be provided by dimension-six interactions between the Higgs and the...
Mr
Kai Schmitz
27/09/2017, 16:56
Cosmology & Astroparticle Physics
In models of inflation driven by an axion-like pseudoscalar field, the
inflaton, a, may couple to the standard model hypercharge gauge field
via a Chern-Simons-type interaction, L ⊃ a F F̃. This coupling results
in the explosive production of hypermagnetic fields during inflation,
which has two interesting consequences: (1) The primordial hypermagnetic
field is maximally helical and,...
Mr
Sebastian Bruggisser
(DESY Theory-Group)
27/09/2017, 17:13
Cosmology & Astroparticle Physics
Varying Yukawas open new possibilities for electroweak baryogenesis. In this talk I will focus on the CP-violation and the baryon-asymmetry. Starting from first principles, I will derive the general form of the CP-violating semiclassical force and the diffusion equations for models with varying Yukawa couplings. This represents a very general framework to determine the baryon-asymmetry...
