Speaker
Pascal Anastasopoulos
(Vienna)
Description
I am planning to give a solid introduction on 1-loop adjoint
masses in intersecting D-brane worlds. I will mainly focus
on models with broken supersymmetry in intersecting D-brane
configurations by slight deviation of the angles from their
supersymmetric values. This was discussed in our recent
paper 1105.0591 [hep-th] with Antoniadis, Benakli, Goodsell,
Vichi. In the open string channel, the string two-point
function receives contributions only from the infrared and
the ultraviolet limits. The latter is due to tree-level
closed string uncanceled NS-NS tadpoles, which we explicitly
reproduce from the effective Born-Infeld action. On the
other hand, the infrared region reproduces the 1-loop
mediation of supersymmetry breaking in the effective gauge
theory, via messengers and their Kaluza-Klein excitations.
In the toroidal set-up considered here, it receives
contributions only from N ~ 4 and N ~ 2 supersymmetric
configurations, and thus always leads at leading order to a
tachyonic direction, in agreement with effective field
theory expectations.
