出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：Maintaining the preserved supersymmetry helps to find the effective Lagrangian on the BPS background
in gauge theories with eight supercharges. As concrete examples, we take 1/2 BPS domain
walls. The Lagrangian is given in terms of the superfields with manifest four preserved
supercharges and is expanded in powers of the slow-movement parameter l . The O(l 0) gives
the superfield form of the BPS equations, whereas all the fluctuation fields follow at O(l 1). The
effective Lagrangian is given by the density of the Kähler potential which emerges automatically
from the l expansion making four preserved supercharges manifest. More complete account of
our method and applications is given in [1] (hep-th/0602289) in which the case of non-Abelian
vortices is also worked out.
