String Theory Seminar
Thursday, September 25, 2003, 2:30pm, 120 Physics, String
Theory
Seminar at Duke, hosted by UNC
Bianca Letizia Cerchiai (UNC,
Chapel Hill)
The
Seiberg-Witten map for a linear time-dependent background
In this talk
(based on paper hep-th/0304030) the Seiberg-Witten map
for a time-dependent background related to a
null-brane orbifold is studied.
The commutation relations of the coordinates are
linear, i.e. it is an
example of the Lie algebra type. The equivalence map
between the Kontsevich
star product for this background and the Weyl-Moyal
star product for a
background with constant noncommutativity parameter
is also studied.
The method used to solve the Seiberg-Witten
equations
is cohomological, and is based on the determination
of a coboundary
operator and then of the corresponding homotopy
operator.