(Near) Conformal Technicolor: What is really new?

TL;DR

This paper reviews the phase diagram of strongly coupled SU(N) gauge theories with various fermionic matter, highlighting recent lattice simulation results and discussing models of near conformal technicolor, concluding that the simplest PGT model embodies conformal technicolor.

Contribution

It provides a comprehensive overview of the current understanding of the phase diagram for SU(N) theories and clarifies the relationship between conformal technicolor models and PGT.

Findings

Latest lattice results support the phase structure of these theories.

The simplest PGT model effectively represents conformal technicolor.

Conformal technicolor models can be realized within the PGT framework.

Abstract

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 constructing viable extensions of the standard model (SM) featuring dynamical electroweak symmetry breaking. Here I summarize the state-of-the-art of the phase diagram for SU(N) gauge theories with fermionic matter transforming according to arbitrary representations of the underlying gauge group. I critically report on the latest results from first principle lattice simulations and then review the principal models of (near) conformal technicolor such as (Next) Minimal Walking Technicolor (MWT) and Partially Gauged Technicolor (PGT). I finally show that the incarnation of the conformal technicolor model is nothing but the simplest PGT model.