GUTs and String-GUTs

Abstract

We look for a connection between string theories and Grand Unified Theories (GUTs), with the aim to look for new insights in the existing four dimensional string-GUT problems. We argue that the construction of consistent string-GUT models could require the use of non canonical affine levels. We list the most common level values related to realistic GUTs.

8 pages, Latex file, no figures. Acepted for publication in Europhysics Letters

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• The Hierarchy Problem and New Dimensions at a Millimeter
• Non SUSY and SUSY one--step Unification
• One Step Non SUSY Unification
• An [SU(3)]^4 Supersymmetric grand unified model

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