"Charges and Monopoles in M-theory"
Relatore: Dott. Kurt Lechner- Universita' di Padova
10 Dicembre 2002 ore 16.30
|As the dynamics of four-dimensional magnetic monopoles requires
the introduction of an unobservable Dirac-string, the dynamics
of magnetic extended objects in M-theory requires the introduction
of an unobservable Dirac-brane. There are, however, relevant situations
in M-theory where the use of Dirac-branes leads to inconsistencies.
After recalling the basic features of extended charges and monopoles in
M-theory, the seminar describes these situations and presents a general
solution to the problem: Dirac-branes have to be replaced with less singular
objects, so called Chern-kernels.