Director at the Max-Planck-Institut für
Chair for Mathematical Physics at the LMU
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- Non-perturbative Effects in
String Theory, the Role and Manifestation of Duality
Symmetries (T-Duality, S-Duality) in String Theory and M-theory
and the Comparison of Non-perturbative Effects and Duality
Symmetries in String Theory and Field Theory.
- The Formulation of (Four-dimensional) Strings on Non-trivial
Backgrounds and D-Brane World Models.
- The Low-energy Effective Action of Four-dimensional Strings,
the Problem of Space-time Supersymmetry Breaking,
`Phenomenological' Aspects of Four-dimensional Strings.
- Various Problems in Gauge Theories and Gravity.
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