Speaker
Anne Ernst
(Desy)
Description
Non-supersymmetric Grand Unified $SO(10)\times U(1)_{\rm PQ}$ models have all the ingredients to solve several fundamental
problems of particle physics and cosmology -- neutrino masses and mixing, baryogenesis, the non-observation of strong CP violation, dark matter, inflation -- in one stroke. The axion - the pseudo Nambu-Goldstone boson arising from the
spontaneous breaking of the $U(1)_{\rm PQ}$ Peccei-Quinn symmetry - is the prime dark matter candidate in this setup.
In this talk I will present how the axion mass can be determined in terms of the relevant gauge symmetry breaking scales in various $SO(10)\times U(1)_{\rm PQ}$ models and which constraints can be placed on these models from the requirement of gauge coupling unification. Finally I will present the steps we have taken in order towards an anlysis of the stability of the electroweak vacuum in our model.
Primary authors
Andreas Ringwald
(DESY)
Anne Ernst
(Desy)
Dr
Carlos Tamarit
(TUM)
