Heterotic strings in symmetric and asymmetric orbifold backgrounds

Luis E. Ibáñez, Javier Mas, Hans Peter Nilles, Fernando Quevedo

Research output: Contribution to journalArticlepeer-review


We present a general formalism for constructing four-dimensional string models from ZN orbifolds. An explicit form for the generalized GSO projector in the construction of twisted and untwisted states is provided, allowing then the computation of the massless spectrum for any embedding of the point group in the gauge degrees of freedom. Constant background fields, in particular Wilson lines, are considered, and the general constraints on them are presented for both symmetric and asymmetric orbifolds. Several examples are provided, including a general classification of the Z3 orbifold models with one Wilson line, a systematic search for SU(3) × SU(2) × U(1)n models with three generations, models with tontinuous symmetry breaking and lower rank, and asymmetric orbifold models with and without Wilson lines.

Original languageEnglish (US)
Pages (from-to)157-196
Number of pages40
JournalNuclear Physics, Section B
Issue number1
StatePublished - Apr 25 1988

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


Dive into the research topics of 'Heterotic strings in symmetric and asymmetric orbifold backgrounds'. Together they form a unique fingerprint.

Cite this