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Effects of a heavy scalar triplet in the primordial lepton asymmetry generation
 Doležalová, Lenka ; Malinský, Michal (advisor) ; Susič, Vasja (referee)
The aim of this thesis is to study the possible effects of the heavy scalar triplet on the primordial baryon asymmetry generated in the Early universe. Such asymmetry is thought to be first generated in the lepton sector and then partially translated into baryon asymmetry by the sphaleron processes. We computed the CP asymmetry generated by the decay of the heavy right-handed neutrinos first in the sole type-I seesaw theory. Then we have set up the Boltz- mann equations for the evolution of the comoving number density of both the right-handed neutrinos and the lepton asymmetry, numerically solved the equa- tions and found the baryon asymmetry arising from the computed CP asym- metry. The scalar triplet was introduced into the model and the relevant CP asymmetry in the type-II seesaw was calculated. Part of the thesis concerns the term in the expression for the CP asymmetry generated in the right-handed neutrino decays which we called "the tail part". It does not appear in any lit- erature sources except one. Its significance was examined and we came to the conclusion that the effect of the tail part should not be neglected as it may be comparable to the effect of the scalar triplet in a certain regime. 1
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