Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2009-09-11
Int.J.Mod.Phys.A24:5737-5763,2009
Physics
High Energy Physics
High Energy Physics - Theory
31 pages. Based on lectures delivered by M. Bianchi at the Fourth Young Researchers Workshop of the European Superstring Theor
Scientific paper
10.1142/S0217751X09048022
In the first lecture, we discuss 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. The second lecture is devoted to non-perturbative superpotentials generated by `gauge' and `exotic' instantons living on D3-branes at orientifold singularities. In the third lecture 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.
Bianchi Massimo
Samsonyan Marine
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