Hirotaka Hayashi
(The University of Tokyo)

8/23/10, 2:00 PM

Formal

Recently, supersymmetric compactifications of F-theory have been considerably studied for the construction of realistic GUT models in string theory. In supersymmetric compactifications for realistic models, dimension-4 proton decay operators have to be brought under control. So-called factorized spectral surface scenario, which uses an U(1) symmetry to forbid dimension-4 proton decay...

Ms
Nana Cabo Bizet
(University Bonn)

8/23/10, 2:17 PM

Formal

Heterotic String Theory compactified on Orbifolds provides exactly solvable models in 4D. Smooth Calabi-Yau compactifications obtained as deformations of some T6/Z7 orbifolds are studied by adding abelian gauge fluxes, which break the original E8xE8 gauge symmetry of the Heterotic Supergravity Action in 10D. We present two blow up models with the gauge group of the SM: One comming from an...

Prof.
Amir Ghezelbash
(University of Saskatchewan)

8/23/10, 2:34 PM

Formal

We construct supersymmetric fully localized intersecting D-brane systems by reducing down the
new M2 and M5 solutions based on embedding self-dual geometries lifted to
M-theory.
One novel feature of M-brane
solutions is that the metric functions depend on two and more than two transverse
coordinates. All the D-brane systems have eight preserved
supersymmetries.

Mr
Sven Krippendorf
(DAMTP, University of Cambridge)

8/23/10, 2:51 PM

Formal

We discuss general properties of D-brane model building at toric singularities. Using dimer techniques to obtain the gauge theory from the structure of the singularity, we extract results on the matter sector and superpotential of the corresponding gauge theory. We show that the number of families in toric phases is always less than or equal to three, with a unique exception being the zeroth...

Dr
Patrick Vaudrevange
(LMU München)

8/23/10, 3:08 PM

We present recent developments on matching singular heterotic orbifolds with
their smooth (resolved) counterparts. The results are illustrated at a Z_2 x
Z_2 heterotic orbifold MSSM with an additional freely acting Z_2.

Dr
Igor Samsonov
(Tomsk Polytechnic University)

8/23/10, 3:25 PM

Formal

We study the general structure of effective actions for
N=2, N=4 and N=8 three-dimensional gauge theories in the N=2, d=3
superspace. We compute the one-loop contributions to the effective
actions in these models and express them in terms of
superconformal invariants. Some aspects of duality for the
obtained effective actions are clarified.