Strings on orbifold lines

Oren Bergman*, Eric Gimon, Barak Kol

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


The orbifold lines IIA/I8 and IIB/I8(-1)FL possess BPS discrete torsion variants which carry fundamental string (NSNS) charge. We show that these variants are actually classified by an integral electric field F from the twisted RR sector, and compute their tension and NSNS charge as a function of F. The analysis employs equivariant K-theory and the string creation phenomenon. The K-theory results demonstrate the corrections to cohomology in the case of torsion; it is found that 8 units of F are invisible at transverse infinity for IIA, and correspondingly 16 units for IIB.

Original languageAmerican English
Pages (from-to)XXIX-24
JournalJournal of High Energy Physics
Issue number5
StatePublished - 2001
Externally publishedYes


  • P-branes
  • Superstring vacua


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