TL;DR
This paper explores how bulk fermions can be implemented in soft wall models using position-dependent bulk masses, showing similar flavor realization to hard wall models but with milder electroweak bounds, allowing lighter Kaluza-Klein modes.
Contribution
It introduces a method for implementing bulk fermions in soft wall models with a well-defined Kaluza-Klein expansion, and compares electroweak constraints to hard wall models.
Findings
Electroweak bounds are milder in soft wall models.
Gauge boson Kaluza-Klein modes can be as light as ~1.5 TeV.
Flavor realization is similar to hard wall models.
Abstract
We discuss the implementation of bulk fermions in soft wall models. The introduction of a position dependent bulk mass allows for a well defined Kaluza-Klein expansion for bulk fermions. The realization of flavor and the contribution to electroweak precision observables are shown to be very similar to the hard wall case. The bounds from electroweak precision test are however milder with gauge boson Kaluza-Klein modes as light as TeV compatible with current experimental bounds.
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