CREATION OF FUNDAMENTAL STRING IN M(ATRIX) THEORY

The potential between two D4-branes at angles with partially unbroken supersymmetry is computed, and is used to discuss the creation of a fu ndamental string when two such D4-branes cross each other in M(atrix) theory. The effective Lagrangian is shown to be anomalous at the 1-loo p approximation, but it can be modified by bare Chem-Simons terms to p reserve the invariance under the large gauge transformation. The resul ting effective potential agrees with that obtained from the string cal culations. The result shows that a fundamental string is created in or der to cancel the repulsive force between two D4-branes at proper angl es, [S0556-2821(98)50204-4].