Physics of Extra Dimensions as IR Limit of Four-Dimensional Theories

Abstract

I discuss the recent work done in collaboration with Chris Hill, Jing Wang and Hsin-Chia Cheng. We construct four-dimensional renormalizable gauge theories which, in their infrared limit, generate the dynamics of gauge interactions in flat extra dimensions. In this construction, the Kaluza-Klein states of extra dimensions arise from having many gauge symmetries in four dimensions. The IR limit is determined by the dynamics of spontaneous breakdown of those symmetries.

Comments: Talk given at the IPPP Workshop on the Phenomenology of Beyond the Standard Model, Durham, Great Britain, May 2001, and at Planck2001 ``From the Planck Scale to the Electroweak Scale'', La Londe-les-Maures, France, May 200