Dynamical Stabilization of the Fermi Scale: Phase Diagram of Strongly Coupled Theories for (Minimal) Walking Technicolor and Unparticles

TL;DR

This paper reviews the phase diagram of strongly coupled gauge theories relevant for dynamical electroweak symmetry breaking, discusses models like Minimal Walking Technicolor and unparticles, and explores their implications for beyond Standard Model physics.

Contribution

It provides a comprehensive analysis of the phase diagram for SU(N) gauge theories with various matter representations, and discusses their application to technicolor models and unparticle physics.

Findings

Phase diagram of SU(N) gauge theories mapped out.

Minimal Walking Technicolor identified as a key benchmark model.

Implications for unparticle models and gauge coupling unification analyzed.

Abstract

We summarize basic features associated to dynamical breaking of the electroweak symmetry. The knowledge of the phase diagram of strongly coupled theories as function of the number of colors, flavors and matter representation plays a fundamental role when trying to construct viable extensions of the standard model (SM). Therefore we will report on the status of the phase diagram for SU(N) gauge theories with fermionic matter transforming according to arbitrary representations of the underlying gauge group. We will discuss how the phase diagram can be used to construct unparticle models. We will then review Minimal Walking Technicolor (MWT) and other extensions, such as partially gauged and split technicolor. MWT is a sufficiently general, symmetry wise, model to be considered as a benchmark for any model aiming at breaking the electroweak symmetry dynamically. The unification of the standard model gauge couplings will be revisited within technicolor extensions of the SM. A number of appendices are added to review some basic methods and to provide useful details. In one of the appendices we will show how to gain information on the spectrum of strongly coupled theories relevant for new extensions of the SM by introducing and using alternative large N limits.