Who: Ulrik Ishøj Søndergaard (CP3-Origins)
When: Thursday, August 1, 2013
The Standard Model of particle interactions triumphed when the discovery of the Higgs boson was announced by the CMS and ATLAS collaboration at the Large Hadron Collider July 4th, 2012. The Standard Model has been very successful, but has limitations as well as some aesthetic problems. Many of these problems are related to the Higgs field. By replacing the Higgs sector of the Standard Model with a new strongly coupled sector some of these problems can be solved. These new strong interactions are referred to as Technicolor interactions.
In this thesis we present results from lattice studies of two concrete Technicolor models, the SO(4) fundamental Minimal Walking Technicolor (MWT) model and the SU(3) sextet MWT. After motivating this type of models by discussing some experimental constraints, we present results from our numerical investigations of their spectra. Our results disfavor the existence of an infrared fixed point in either model.
This thesis also contain a presentation of our attempt to accelerate Monte Carlo simulations of lattice gauge theories, by performing the calculations on graphics processing units (GPUs). We discuss several optimizations and test the performance using as test cases SU(2) gauge theories with Wilson fermions transforming in the fundamental and adjoint representation.