Localized Gravitons, Gauge Bosons and Chiral Fermions in Smooth Spaces Generated by a Bounce

TL;DR

This paper explores five-dimensional Einstein-scalar field solutions with bounce geometries, demonstrating localization of gravitons, chiral fermions, and gauge bosons, advancing models of particle localization in smooth warped spaces.

Contribution

It introduces smooth bounce solutions in 5D Einstein-scalar models that localize gravitons, chiral fermions, and gauge bosons, extending previous brane-world scenarios.

Findings

Gravitons are localized similarly to Randall-Sundrum models.

A chiral zero mode for fermions is localized at the bounce.

Bulk scalar fields like the dilaton can localize gauge bosons.

Abstract

We study five-dimensional solutions to Einstein equations coupled to a scalar field. Bounce-type solutions for the scalar field are associated with AdS_5 spaces with smooth warp functions. Gravitons are dynamically localized in this framework in analogy to the Randall-Sundrum solution whereas, a bulk fermion gives rise to a single chiral zero mode localized at the bounce. Additional bulk scalar fields are incorporated in this picture. The dilaton, as a bulk scalar leads, through its coupling, to localized gauge boson fields, something that holds also in the case that the bounce system is replaced by a brane.