Non-Universal Anomalies in Heterotic String Constructions

Details Non-Universal Anomalies in Heterotic String Constructions Non-Universal Anomalies in Heterotic String Constructions

2012-03-26

arxiv.org/abs/1203.5789v1

Physics

High Energy Physics

High Energy Physics - Theory

22 pages, 4 tables

Scientific paper

We investigate anomalies on heterotic orbifolds and their blowups. We give a simple example of an orbifold blowup which contains anomalous U(1) symmetries that are canceled by axions which couple non-universally to the different gauge groups, thus clarifying some confusion which recently arose in the literature concerning anomaly universality. We argue that non-universal axionic couplings are the general case, and that the couplings are only universal in the case of orbifolds. We comment on the consequences of this non-universality for discrete R symmetries. We furthermore investigate the origin of discrete (R and non-R) symmetries on smooth Calabi-Yau manifolds.

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