Tasi 2009 lectures: The Higgs as a Composite Nambu-Goldstone Boson

TL;DR

This paper introduces theories where the Higgs boson is a composite Nambu-Goldstone boson arising from new strong interactions, discussing symmetry patterns, analogies with QCD pions, and holographic models involving 5-dimensional gauge fields.

Contribution

It provides a comprehensive overview of composite Higgs models, including symmetry considerations and holographic approaches, highlighting their theoretical foundations and potential phenomenological implications.

Findings

Higgs as a composite Nambu-Goldstone boson from strong dynamics

Analogy between composite Higgs and QCD pions

Holographic realization via 5D gauge fields

Abstract

This is an introduction to theories where the Higgs is a composite Nambu-Goldstone boson of a new strongly-interacting dynamics not much above the weak scale. A general discussion is presented based on the pattern of global symmetries at low energy, and the analogy with the QCD pion is analyzed. The last part of the lectures shows how a composite Higgs can emerge as the hologram of a 5-dimensional gauge field.