Nonuniversal anomalies in heterotic string constructions
Abstract
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.
- Publication:
-
Physical Review D
- Pub Date:
- May 2012
- DOI:
- 10.1103/PhysRevD.85.106010
- arXiv:
- arXiv:1203.5789
- Bibcode:
- 2012PhRvD..85j6010L
- Keywords:
-
- 11.25.Mj;
- 04.65.+e;
- Compactification and four-dimensional models;
- Supergravity;
- High Energy Physics - Theory
- E-Print:
- 22 pages, 4 tables, publication version, minor corrections