title: Brane world generated dynamically from string type IIB matrices
abstract: We have recently proposed a dynamical mechanism that may realize a flat four-dimensional space-time as a brane in type IIB superstring theory. A crucial role is played by the phase of the chiral fermion integral associated with the IKKT (Ishibashi-Kawai-Kitazawa-Tsuchiya) matrix theory, which is conjectured to be a nonperturbative definition of type IIB superstring theory. We demonstrate our mechanism by studying a simplified model, in which we find that a lower-dimensional brane indeed appears dynamically. We also comment on some implications of our mechanism on model building of the brane world.
authors.affiliation: The Niels Bohr Institute, Blegdamsvej 17, DK-2100 Copenhagen O, Denmark.
authors.initials: J
authors.lastname: Nishimura
authors.initials: G
authors.lastname: Vernizzi