Journal
INTERNATIONAL JOURNAL OF MODERN PHYSICS A
Volume 24, Issue 31, Pages 5737-5763Publisher
WORLD SCIENTIFIC PUBL CO PTE LTD
DOI: 10.1142/S0217751X09048022
Keywords
Superstring theory; open and unoriented strings; D-branes; instantons; nonperturbative superpotential; threshold corrections
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Funding
- European Superstring Theory Network [MRTN-CT-2004-512194]
- ERC [226455]
- Italian MIUR-PRIN [20075ATT78]
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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 T-4/Z(2). 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.
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