Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2000-10-11
Phys.Lett. B497 (2001) 271-280
Physics
High Energy Physics
High Energy Physics - Theory
16 pages; minor corrections, 1 reference added; version accepted in Phys. Lett. B
Scientific paper
10.1016/S0370-2693(00)01329-0
We propose a mechanism ensuring (quasi)localization of massless gauge fields on a brane. The mechanism does not rely on BPS properties of the brane and can be realized in any theory where charged particles are confined to the world-volume. The localized matter fluctuations induce a gauge kinetic term on the brane. At short distances the resulting propagator for the gauge field is {\it identical} to the four-dimensional propagator. The gauge theory on the brane is effectively four-dimensional at short distances; it becomes higher-dimensional on very large (cosmic) scales. The brane-bulk system exhibits the phenomenon of ``infrared transparency''. As a result, only very low frequency modes can escape into extra dimensions. In this framework the large wavelength cosmic radiation can dissipate in extra space at a rate that may be observable, in principle. We briefly discuss some astrophysical consequences of this scenario. The same mechanism of localization of gauge fields may work in Kaplan's framework for domain wall chiral fermions on lattices.
Dvali Gia
Gabadadze Gregory
Shifman Michael
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