Hypercharge flux in heterotic compactifications
2015 (English)In: Physical Review D, ISSN 1550-7998, Vol. 91, no 4, 046008Article in journal (Refereed) Published
We study heterotic Calabi-Yau models with hypercharge flux breaking, where the visible E-8 gauge group is directly broken to the standard model group by a nonflat gauge bundle, rather than by a two-step process involving an intermediate grand unified theory and a Wilson line. It is shown that the required alternative E-8 embeddings of hypercharge, normalized as required for gauge unification, can be found and we classify these possibilities. However, for all but one of these embeddings we prove a general no-go theorem which asserts that no suitable geometry and vector bundle leading to a standard model spectrum can be found. Intuitively, this happens due to the large number of index conditions which have to be imposed in order to obtain a correct physical spectrum in the absence of an underlying grand unified theory.
Place, publisher, year, edition, pages
2015. Vol. 91, no 4, 046008
IdentifiersURN: urn:nbn:se:uu:diva-248840DOI: 10.1103/PhysRevD.91.046008ISI: 000350257200004OAI: oai:DiVA.org:uu-248840DiVA: diva2:801103