TY - JOUR
T1 - Localized U(1) gauge fields, millicharged particles, and holography
AU - Batell, Brian
AU - Gherghetta, Tony
PY - 2006
Y1 - 2006
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevD.73.045016
DO - 10.1103/PhysRevD.73.045016
M3 - Article
AN - SCOPUS:33244461322
SN - 1550-7998
VL - 73
JO - Physical Review D - Particles, Fields, Gravitation and Cosmology
JF - Physical Review D - Particles, Fields, Gravitation and Cosmology
IS - 4
M1 - 045016
ER -