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The consequences of large radius extra space-time compactified dimensions onthe four dimensional one loop effective potential are investigated for a modelwhich includes scalar self interactions and Yukawa coupling to fermions. TheKaluza-Klein tower of states associated with the extra compact dimensionsshifts the location of the effective potential minimum and modifies itscurvature. The dependence of these effects on the radius of the extra dimensionis illustrated for various choices of coupling constants and masses. For largeradii, the consequence of twisting the fermion boundary condition on thecompactified dimensions is numerically found to produce but a negligible effecton the effective potential.Comment: 14 pages, LaTeX, 6 Postscript figure

THE EFFECTIVE POTENTIAL AND ADDITIONAL LARGE RADIUS COMPACTIFIED SPACE–TIME DIMENSIONS