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Holographic gauged NJL model and applications

Holographic gauged NJL model and applications
Holographic gauged NJL model and applications
There are two models of spontaneous chiral symmetry breaking in strongly coupled gauge theories. The symmetry can be broken when a chiral condensate is formed by the non-abelian gauge interactions in the ”natural” QCD vacuum or the condensate can be generated or enhanced by the inclusion of a Nambu-Jona-Lasinio (NJL) term. We study the effect of both of these using AdS/CFT, a strong-weak duality which allows us to transform the gauge theory calculations into a problem of D brane embeddings in an AdS spacetime. This model, termed dynamic AdS/QCD, is then applied to technicolour. Technicolour is a phenomenological theory of electroweak symmetry breaking in which the chiral symmetry breaking mechanism of a new QCD-like sector is exploited to provide the electroweak symmetry breaking mechanism. We first apply the dynamic AdS/QCD theory to studying the physical QCD meson spectrum both with and without four fermion interactions in chapter 4. Next we turn our attention to technicolour. In chapter 5 we discuss extended technicolour using an NJL term to enhance the top mass. While in chapter 6 we discuss ideal walking theories where the theory remains strongly coupled over a large range of scales.
University of Southampton
Clemens, William
43bd1d41-555e-48f1-9101-3b4d6cec45da
Clemens, William
43bd1d41-555e-48f1-9101-3b4d6cec45da
Evans, Nicholas
33dfbb52-64dd-4c1f-9cd1-074faf2be4b3

Clemens, William (2019) Holographic gauged NJL model and applications. University of Southampton, Doctoral Thesis, 119pp.

Record type: Thesis (Doctoral)

Abstract

There are two models of spontaneous chiral symmetry breaking in strongly coupled gauge theories. The symmetry can be broken when a chiral condensate is formed by the non-abelian gauge interactions in the ”natural” QCD vacuum or the condensate can be generated or enhanced by the inclusion of a Nambu-Jona-Lasinio (NJL) term. We study the effect of both of these using AdS/CFT, a strong-weak duality which allows us to transform the gauge theory calculations into a problem of D brane embeddings in an AdS spacetime. This model, termed dynamic AdS/QCD, is then applied to technicolour. Technicolour is a phenomenological theory of electroweak symmetry breaking in which the chiral symmetry breaking mechanism of a new QCD-like sector is exploited to provide the electroweak symmetry breaking mechanism. We first apply the dynamic AdS/QCD theory to studying the physical QCD meson spectrum both with and without four fermion interactions in chapter 4. Next we turn our attention to technicolour. In chapter 5 we discuss extended technicolour using an NJL term to enhance the top mass. While in chapter 6 we discuss ideal walking theories where the theory remains strongly coupled over a large range of scales.

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Published date: August 2019

Identifiers

Local EPrints ID: 438100
URI: http://eprints.soton.ac.uk/id/eprint/438100
PURE UUID: 10f00f5b-455c-4da0-8830-4f311167f31d

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Date deposited: 28 Feb 2020 17:31
Last modified: 28 Feb 2020 17:31

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Contributors

Author: William Clemens
Thesis advisor: Nicholas Evans

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