Localized U(1) gauge fields, millicharged particles, and holography

Brian Batell and Tony Gherghetta
Phys. Rev. D 73, 045016 – Published 16 February 2006

Abstract

We consider U(1) gauge fields in a slice of AdS5 with bulk and boundary mass parameters. The zero mode of a bulk U(1) gauge field can be localized either on the UV or IR brane. This leads to a simple model of millicharged particles in which fermions can have arbitrarily small electric charge. In the electroweak sector we also discuss phenomenological implications of a localized U(1)Y gauge boson. Using the AdS/CFT correspondence we present the 4D holographic interpretation of the 5D model. In particular the photon is shown to be a composite particle when localized near the IR brane, whereas it is elementary when localized near the UV brane. In the dual interpretation the millicharge results from an elementary fermion coupling to a composite photon via a vector current with large anomalous dimension.

  • Figure
  • Received 29 December 2005

DOI:https://doi.org/10.1103/PhysRevD.73.045016

©2006 American Physical Society

Authors & Affiliations

Brian Batell* and Tony Gherghetta

  • School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA

  • *Electronic address: batell@physics.umn.edu
  • Electronic address: tgher@physics.umn.edu

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Issue

Vol. 73, Iss. 4 — 15 February 2006

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