Zero modes of six-dimensional Abelian vortices

TL;DR

This paper studies the behavior of various fluctuation modes in six-dimensional Abelian vortices, finding that gravitational zero modes are localized while gauge field modes are also localized, but some vector and scalar modes are not.

Contribution

It provides a detailed analysis of zero modes in six-dimensional Abelian-Higgs vortex models, highlighting which modes are localized or delocalized.

Findings

Graviton zero mode is localized in the warped geometry.

Gauge field zero mode is localized.

Spin one and spin zero fluctuations have non-localized zero modes.

Abstract

We analyze the fluctuations of Nielsen-Olesen vortices arising in the six-dimensional Abelian-Higgs model. The regular geometry generated by the defect breaks spontaneously six-dimensional Poincar\'e symmetry leading to a warped space-time with finite four-dimensional Planck mass. As a consequence, the zero mode of the spin two fluctuations of the geometry is always localized but the graviphoton fields, corresponding to spin one metric fluctuations, give rise to zero modes which are not localized either because of their behaviour at infinity or because of their behaviour near the core of the vortex. A similar situation occurs for spin zero fluctuations. Gauge field fluctuations exhibit a localized zero mode.