SESZIONE DI TORINO
We start discussing the properties of magnetized D branes that have the important property of allowing for fermionic chiral open strings to describe quarks and leptons of the Standard Model. We then discuss the problems that one encounters in string theory for computing in a magnetized brane world the parameters of the 4-dim low energy Lagrangian even in toroidal compactifications. Then we discuss a field theoretical approch developed by Cremades, Ibanez and Marchesano that allows to compute them at least in the field theory limit (zero slope limit). In particular, we show how to compute the Kaehler metrics obtaining a result in agreement with the expressions obtained from instanton calculus. We conclude discussing some arbitrariness still present in our method.

DATA: 21-11-2008