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 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.
|Original language||English (US)|
|Number of pages||10|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|State||Published - Jan 11 2001|
Bibliographical noteFunding Information:
The authors are grateful to B. Bajc, C. Deffayet, A. Glassgold, P. Huggins, V. Rubakov and A. Sirlin for useful discussions. G.D. and G.G. thank the Aspen Center for Physics for hospitality where a part of this project was performed. The work of G.D. was supported by David and Lucille Packard Foundation Fellowship for Science and Engineering, and by Alfred P. Sloan Foundation Fellowship and by NSF grant PHY-0070787. Work of G.G. and M.S. was supported by DOE grant DE-FG02-94ER408.