A D-brane alternative to unification

Abstract

We propose a minimal embedding of the Standard Model spectrum in a D-brane configuration of type I string theory. The SU(3) color and SU(2) weak interactions arise from two different collections of branes. The model is neither grand unified nor supersymmetric but it naturally leads to the right prediction of the weak angle for a string scale of the order of a few TeV. It requires two Higgs doublets and guarantees proton stability.

LateX, 14 pages, one figure; v2: References added, extra comment added on accomodating right-handed neutrinos

References in corpus (4)

• Gauge couplings in four-dimensional Type I string orbifolds
• Neutrino Masses and Oscillations in Models with Large Extra Dimensions
• Small Instantons and Weak Scale String Theory
• M-Theory and Hypercharge

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