Quantum Field Theories With Compact Noncommutative Extra Dimensions

Abstract

We study field theories on spaces with additional compact noncommutative dimensions. As an example, we study ϕ^3 on R^{1,3}\times T^{2}_θusing perturbation theory. The infrared divergences in the noncompact theory give rise to unusual dynamics for the mode of ϕwhich is constant along the torus. Correlation functions involving this mode vanish. Moreover, we show that the spectrum of Kaluza-Klein excitations can be very different from the analogous commuting theory. There is an additional contribution to the Kaluza-Klein mass formula that resembles the contribution of winding states in string theory. We also consider the effect of noncommutativity on the four dimensional Kaluza-Klein excitations of a six dimensional gauge field.

15 pages, 4 Postscript figures, uses harvmac,references added, corrected typos in two equations, expanded discussion of gauge field zero mode dynamics

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