Generalised Holographic Electroweak Symmetry Breaking Models and the Possibility of Negative S

TL;DR

This paper explores how different boundary conditions and background modifications in holographic models affect electroweak symmetry breaking, focusing on the S parameter's sign and unitarity issues.

Contribution

It analyzes the impact of boundary terms and background changes on the S parameter and discusses the relationships between various AdS slice models of symmetry breaking.

Findings

Negative S parameter scenarios are possible under certain boundary conditions.

Unitarity constraints influence the viability of models with negative S.

Connections between different AdS models of symmetry breaking are established.

Abstract

Within an AdS/CFT inspired model of electroweak symmetry breaking the effects of various boundary terms and modifications to the background are studied. The effect on the S precision parameter is discussed with particular attention to its sign and whether the theory is unitary when S<0. Connections between the various possible AdS slice models of symmetry breaking are discussed.