Speaker
Katerina Jarkovska
Description
The minimal renormalizable SO(10) Higgs model in which the unified symmetry is broken down by the adjoint representation is known to suffer from tachyonic instabilities along all potentially realistic symmetry-breaking chains. Few years ago, this issue has been identified as a mere relic of the tree level calculations and the radiative corrections to the masses of the pair of the “most dangerous” pseudo-Goldstone scalars in the model’s spectrum have been computed. Remarkably enough, it turns out that - in its minimal potentially realistic renormalizable realization - there is third pseudo-Goldstone scalar (a full SM singlet) suffering from the same disease that, until recently, happened to escape the community’s attention. In this talk we will provide a short account of the calculation of the one-loop correction to its mass and comment briefly on the prospects of an implementation of this scheme within a fully realistic grand unified scenario.
