Classical solutions for exotic instantons?

Marco Billò, Marialuisa Frau, Laurent Gallot, Alberto Lerda, Igor Pesando

Research output: Contribution to journalArticlepeer-review

Abstract

We consider the D7/D(-1) system in Type I′ as a prototypical ''exotic'' brane instanton. With respect to systems such as the D3/D(-1) ones, which correspond to gauge instantons in four dimensions, exotic systems lack the bosonic mixed moduli w of the ADHM construction, related to the instanton size ρ, and their possible field-theoretical interpretation as classical solutions is an important open question. For the system at hand, we propose that it corresponds to the point-like limit ρ 0 of the eight-dimensional so-called SO(8) instanton solution. This configuration is a solution of the quartic term of the non-abelian D7 action, i.e. the term which stays finite in the limit α′ 0 with g s fixed that preserves the D(-1) effects. As a necessary consistency condition, we check that the next order term in the non-abelian effective action vanishes on the SO(8) solution so that the limit we take is well-defined.

Original languageEnglish
Article number056
JournalJournal of High Energy Physics
Volume2009
Issue number3
DOIs
Publication statusPublished - 2009

Keywords

  • D-branes
  • Solitons monopoles and instantons
  • Superstrings and heterotic strings

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