Comments on A, B, C chains of heterotic and Type II vacua
Abstract
We construct, as hypersurfaces in toric varieties, CalabiYau manifolds corresponding to Ftheory vacua dual to E_{8} × E_{8} heterotic strings compactified to six dimensions on K3 surfaces with nonsemisimple gauge backgrounds. These vacua were studied in the recent work of Aldazabal, Font, Ibáñez and Uranga as well as by Klemm, Mayr and Vafa. We extend their results by constructing many more examples, corresponding to enhanced gauge symmetries, by noting that they can be obtained from previously known CalabiYau manifolds corresponding to K3 compactification of heterotic strings with simple gauge backgrounds by means of extremal transitions of the conifold type.
 Publication:

Nuclear Physics B
 Pub Date:
 February 1997
 DOI:
 10.1016/S05503213(97)00374X
 arXiv:
 arXiv:hepth/9703148
 Bibcode:
 1997NuPhB.502..594C
 Keywords:

 High Energy Physics  Theory
 EPrint:
 27p Plain TeX, 6 figures (4 in color) included via epsf.tex