NOTES ON UNORIENTED D-BRANE INSTANTONS

Author:

BIANCHI MASSIMO1,SAMSONYAN MARINE1

Affiliation:

1. Dipartimento di Fisica and Sezione I.N.F.N., Università di Roma "Tor Vergata", Via della Ricerca Scientifica, 00133 Roma, Italy

Abstract

We review basic aspects of worldsheet and penta-brane instantons as well as (unoriented) D-brane instantons, which is our main focus here, and threshold corrections to BPS-saturated couplings. We then consider nonperturbative superpotentials generated by "gauge" and "exotic" instantons living on D3-branes at orientifold singularities. Moreover, we discuss the interplay between worldsheet and D-string instantons on T4/Z2. We focus on a 4-Fermi amplitude, give Heterotic and perturbative Type I descriptions, and offer a multi-D-string instanton interpretation. We conclude with possible interesting developments.

Publisher

World Scientific Pub Co Pte Lt

Subject

Astronomy and Astrophysics,Nuclear and High Energy Physics,Atomic and Molecular Physics, and Optics

Reference75 articles.

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