Supersymmetric (non)abelian bundles in the typeI and SO(32) heterotic string
Abstract
We discuss perturbative fourdimensional compactifications of both the SO(32) heterotic and the typeI string on smooth CalabiYau manifolds endowed with general nonabelian and abelian bundles. We analyse the generalized GreenSchwarz mechanism for multiple anomalous U(1) factors and derive the generically nonuniversal oneloop threshold corrections to the gauge kinetic function as well as the oneloop corrected FayetIliopoulos terms. The latter can be interpreted as a stringy oneloop correction to the DonaldsonUhlenbeckYau condition. Applying Sduality, for the typeI string we obtain the perturbative Πstability condition for nonabelian bundles on curved spaces. Some simple examples are given, and we qualitatively discuss some generic phenomenological aspects of this kind of string vacua. In particular, we point out that in principle an intermediate string scale scenario with TeV scale large extra dimensions might be possible for the heterotic string.
 Publication:

Journal of High Energy Physics
 Pub Date:
 August 2005
 DOI:
 10.1088/11266708/2005/08/009
 arXiv:
 arXiv:hepth/0507041
 Bibcode:
 2005JHEP...08..009B
 Keywords:

 High Energy Physics  Theory;
 High Energy Physics  Phenomenology
 EPrint:
 LaTeX, 32 pages, v2: refs added