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SUMMARY:Unoriented D-brane instantons - Massimo Bianchi (Universita' di Ro
 ma &quot\;Tor Vergata&quot\; )
DTSTART:20130123T141500Z
DTEND:20130123T151500Z
UID:TALK42863@talks.cam.ac.uk
CONTACT:Dr Dorigoni
DESCRIPTION:We give a pedagogical introduction to D-brane instanton effect
 s in vacuum configurations with open and unoriented strings. We focus on q
 uiver gauge theories for unoriented D-branes at orbifold singularities and
  describe in some detail the Z_3 case\, where both `gauge' and `exotic' in
 stantons can generate non-perturbative super potentials\, and the Z_5 case
 \, where supersymmetry breaking may arise from the combined effect of `gau
 ge' instantons and a FI D-term.
LOCATION:MR2\, Centre for Mathematical Sciences
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