# SEMINAR

CP and other symmetries of symmetries
* Andreas Trautner*
(**Technische Universität München, Germany**)

**Sala 2.8.3, IST, Dept. de Física**

**Tuesday, March 22nd, 2016 at 05:00 PM**

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**Abstract**
`
I will explain what an outer automorphism ("symmetry of a symmetry") is and how one can understand CP transformations as a special class of outer automorphisms.
I will show how this knowledge can be used in order to construct models with explicit geometrical CP violation.
Based on the example of a 3HDM i will then discuss outer automorphism transformation which are not CP transformations.
These transformations allow us to substantially reduce the physical parameter space of a model, calculate the VEVs in a very simple way,
and thereby predict the phases for spontaneous geometrical CP violation.`

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