Electroweak Symmetry Breaking from Gauge/Gravity Duality

TL;DR

This paper employs gauge/gravity duality to analyze walking technicolor models, providing analytical insights into the S-parameter and demonstrating how holographic renormalization can address divergences, advancing understanding of dynamical electroweak symmetry breaking.

Contribution

The study develops an analytical approach to holographic technicolor models and applies it to a walking technicolor scenario, including chiral symmetry breaking and divergence removal via holographic renormalization.

Findings

Analytical understanding of the Peskin-Takeuchi S-parameter.

Application of holographic methods to walking technicolor.

Divergences in the S-parameter can be renormalized holographically.

Abstract

We use the gauge/gravity duality to study a model of walking technicolor. The latter is a phenomenologically promising framework for dynamical electroweak symmetry breaking. A traditional problem for technicolor models has been the need to address gauge theories at strong coupling. Recent developments in gauge/gravity duality provide a powerful tool for handling this problem. First, we revisit previously considered holographic models of QCD-like technicolor from D-branes. In particular, we develop analytical understanding of earlier numerical computations of the Peskin-Takeuchi S-parameter. Then we apply this method to the investigation of a model of walking technicolor, obtained by embedding D7 - anti-D7 probe branes in a recently discovered type IIB background dual to walking behaviour. As a necessary step, we also show that there is an embedding of the techniflavor branes, that realizes chiral symmetry breaking. Finally, we show that the divergences that appear in the S-parameter can be removed by using holographic renormalization.